Right now, I have to have my linker set to "Link All" in order to submit to the App Store because of the deprecated UIWebView. While doing this, I had to add [Preserve(AllMembers = true)] to my DataStores to make them work this way, but then I ran into this issue.
The following line will return null:
var dp = DependencyService.Get<ITextMeter>();
After looking into the solution, it seemed the best answer would be to add the following line into the AppDelegate:
DependencyService.Register<ITextMeter, TextMeterImplementation>();
Once I did that, I started receiving this exception:
DependencyService: System.MissingMethodException: Default constructor not found for [Interface]
https://forums.xamarin.com/discussion/71072/dependencyservice-system-missingmethodexception-default-constructor-not-found-for-interface
I just want to find a working solution that will allow everything to work with the linker set to "Link All". Thanks in advance.
ITextMeter:
using System;
using Xamarin.Forms.Internals;
namespace RedSwipe.Services
{
public interface ITextMeter
{
double MeasureTextSize(string text, double width, double fontSize, string fontName = null);
}
}
TextMeterImplementation:
using System.Drawing;
using Foundation;
using RedSwipe.iOS.Services;
using RedSwipe.Services;
using UIKit;
[assembly: Xamarin.Forms.Dependency(typeof(TextMeterImplementation))]
namespace RedSwipe.iOS.Services
{
public class TextMeterImplementation : ITextMeter
{
public double MeasureTextSize(string text, double width, double fontSize, string fontName = null)
{
var nsText = new NSString(text);
var boundSize = new SizeF((float)width, float.MaxValue);
var options = NSStringDrawingOptions.UsesFontLeading | NSStringDrawingOptions.UsesLineFragmentOrigin;
if (fontName == null)
{
fontName = "HelveticaNeue";
}
var attributes = new UIStringAttributes
{
Font = UIFont.FromName(fontName, (float)fontSize)
};
var sizeF = nsText.GetBoundingRect(boundSize, options, attributes, null).Size;
//return new Xamarin.Forms.Size((double)sizeF.Width, (double)sizeF.Height);
return (double)sizeF.Height;
}
}
}
Add this [Preserve (AllMembers = true)] in your TextMeterImplementation before class implementation.
Your code would be like:
using System.Drawing;
using Foundation;
using RedSwipe.iOS.Services;
using RedSwipe.Services;
using UIKit;
using Xamarin.Forms.Internals; // Add This import
[assembly: Xamarin.Forms.Dependency(typeof(TextMeterImplementation))]
namespace RedSwipe.iOS.Services
{
[Preserve (AllMembers = true)]
public class TextMeterImplementation : ITextMeter
{
public double MeasureTextSize(string text, double width, double fontSize, string fontName = null)
{
var nsText = new NSString(text);
var boundSize = new SizeF((float)width, float.MaxValue);
var options = NSStringDrawingOptions.UsesFontLeading | NSStringDrawingOptions.UsesLineFragmentOrigin;
if (fontName == null)
{
fontName = "HelveticaNeue";
}
var attributes = new UIStringAttributes
{
Font = UIFont.FromName(fontName, (float)fontSize)
};
var sizeF = nsText.GetBoundingRect(boundSize, options, attributes, null).Size;
//return new Xamarin.Forms.Size((double)sizeF.Width, (double)sizeF.Height);
return (double)sizeF.Height;
}
}
}
please review my code as I am not able to attach any file in EmailMessageBuilder.
Also I need to understand about the ContentType, what should I pass in ContentType?
FileData filedata = await CrossFilePicker.Current.PickFile();
String Path = CrossGetLocalFilePath.Current.GetLocalPath(filedata.FileName);
var emailMessenger = CrossMessaging.Current.EmailMessenger;
if (emailMessenger.CanSendEmail)
{
var email = new EmailMessageBuilder()
.To("to.plugins#xamarin.com")
.Subject("Xamarin Messaging Plugin")
.Body("Well hello there from Xam.Messaging.Plugin")
.WithAttachment(Path, "image/jpeg")
.Build();
emailMessenger.SendEmail(email);
}
I am using above code in Xamarin.forms (Portable), my attachment could be an image, video or any file.
Getting error:
Failed to attach file due to IO error.
I never used the CrossFilePicker plugin and CrossGetLocalFilePath plugin before but I find the source code here:
CrossFilePicker : https://github.com/Studyxnet/FilePicker-Plugin-for-Xamarin-and-Windows/tree/master/FilePicker/FilePicker
CrossGetLocalFilePath:https://github.com/bradyjoslin/GetLocalFilePathPlugin/blob/master/GetLocalFilePath/GetLocalFilePath.Plugin.Android/GetLocalFilePathImplementation.cs
This is the FileData object you got when you call CrossFilePicker.Current.PickFile();
namespace Plugin.FilePicker.Abstractions
{
public class FileData
{
public byte[] DataArray { get; set; }
public string FileName { get; set; }
}
}
DataArray is your file data, and FileName is your file name. It does not contain the file path.
And you call the another plugin CrossGetLocalFilePath to get the file path according to the file name.
in the CrossGetLocalFilePath source code it just implements in Android platform:
public class GetLocalFilePathImplementation : IGetLocalFilePath
{
public string GetLocalPath(string fileName)
{
string path = Environment.GetFolderPath(Environment.SpecialFolder.Personal);
return System.IO.Path.Combine(path, fileName);
}
}
it not return the file path you want. It returned system special file path.
So in your case it is not possible to get the file path by these plugins.
But I recommend you to overwrite the CrossFilePicker plugin.
Take UWP as an example：
public class FilePickerImplementation : IFilePicker
{
public async Task<FileData> PickFile()
{
var picker = new Windows.Storage.Pickers.FileOpenPicker();
picker.ViewMode = Windows.Storage.Pickers.PickerViewMode.List;
picker.SuggestedStartLocation =
Windows.Storage.Pickers.PickerLocationId.DocumentsLibrary;
picker.FileTypeFilter.Add("*");
Windows.Storage.StorageFile file = await picker.PickSingleFileAsync();
if (file != null)
{
var array = await ReadFile(file);
return new FileData
{
DataArray = array,
FileName = file.Name
FilePath = file.Path;
};
}
else
{
return null;
}
}
This is the implementation of file picker in UWP. You can add the FilePath property in the FileData Object as the code shows before.
We can get the path if we are using the below plugin for the Media Capture and Select image from the Gallery.
Xam.Plugin.Media
Thank You.
I am using Xamarin Forms to develop an app and using SQlite to store the user details. Just started with windows(Windows 10). Does SQLite has support for UWP, I have referred some sites and its saying it does support. but when I am trying, the connection is always null.
The code i am using:
public SQLite.Net.SQLiteConnection GetConnection()
{
var sqliteFilename = "Sample.db3";
string path = Path.Combin(ApplicationData.Current.LocalFolder.Path, sqliteFilename);
if (!File.Exists(path))
{
File.Create(path + sqliteFilename);
}
var plat = new SQLite.Net.Platform.WinRT.SQLitePlatformWinRT();
var conn = new SQLite.Net.SQLiteConnection(plat,path);
return conn;
}
}
Any help or suggestion would be much appreciated.
Note: I have installed the SQLite.Net-PCL and added reference to SQLite for Universal App Platform
Inside your App.cs I have a static variable called:
public static LocalDatabase Database { get; private set; }
public App()
{
Database = new LocalDatabase();...
}
And then you can access your Database class on any place of your controller like: App.Database
For reference LocalDatabase class will contain:
public class LocalDatabase
{
static readonly object locker = new object ();
static SQLiteConnection database;
string DatabasePath {
get {
const string sqliteFilename = "LocalDatabaseSQLite.db3";
#if __IOS__
string documentsPath = Environment.GetFolderPath (Environment.SpecialFolder.Personal); // Documents folder
string libraryPath = Path.Combine (documentsPath, "..", "Library"); // Library folder
var path = Path.Combine (libraryPath, sqliteFilename);
#else
#if __ANDROID__
string documentsPath = Environment.GetFolderPath(Environment.SpecialFolder.Personal); // Documents folder
var path = Path.Combine(documentsPath, sqliteFilename);
#else
// WinPhone
var path = Path.Combine(Windows.Storage.ApplicationData.Current.LocalFolder.Path, sqliteFilename); ;
#endif
#endif
return path;
}
}
public LocalDatabase ()
{
database = new SQLiteConnection (DatabasePath);
database.CreateTable<UserSQLModel> ();
//All your create tables...
}
}
I use only Microsoft Azure Storage and no other Azure products/services. I upload files to my storage blob via ftp type client (GoodSync), and I need to change the content type of all the files based on their file extension after they are already in the Blob. I have looked around and have not found out how to do this without having one of their VPS with PowerShell. What are my options and how do I accomplish this? I really need step by step here.
I recently had the same issue so I created a simple utility class in order to "fix" content type based on file's extension. You can read details here
What you need to do is parse each file in your Azure Storage Containers and update ContentType based on a dictionary that defines which MIME type is appropriate for each file extension.
// Connect to your storage account
CloudStorageAccount storageAccount = CloudStorageAccount.Parse(storageConnectionString);
// Load Container with the specified name
private CloudBlobContainer GetCloudBlobContainer(string name)
{
CloudBlobClient cloudBlobClient = _storageAccount.CreateCloudBlobClient();
return cloudBlobClient.GetContainerReference(name.ToLowerInvariant());
}
// Parse all files in your container and apply proper ContentType
private void ResetContainer(CloudBlobContainer container)
{
if (!container.Exists()) return;
Trace.WriteLine($"Ready to parse {container.Name} container");
Trace.WriteLine("------------------------------------------------");
var blobs = container.ListBlobs().ToList();
var total = blobs.Count;
var counter = 1;
foreach (var blob in blobs)
{
if (blob is CloudBlobDirectory) continue;
var cloudBlob = (CloudBlob)blob;
var extension = Path.GetExtension(cloudBlob.Uri.AbsoluteUri);
string contentType;
_contentTypes.TryGetValue(extension, out contentType);
if (string.IsNullOrEmpty(contentType)) continue;
Trace.Write($"{counter++} of {total} : {cloudBlob.Name}");
if (cloudBlob.Properties.ContentType == contentType)
{
Trace.WriteLine($" ({cloudBlob.Properties.ContentType}) (skipped)");
continue;
}
cloudBlob.Properties.ContentType = contentType;
cloudBlob.SetProperties();
Trace.WriteLine($" ({cloudBlob.Properties.ContentType}) (reset)");
}
}
_contentTypes is a dictionary that contains the appropriate MIME type for each file extension:
private readonly Dictionary _contentTypes = new Dictionary()
{
{".jpeg", "image/jpeg"},
{".jpg", "image/jpeg" }
};
Full list of content types and source code can be found here.
Here you are a refreshed version for latest Azure.Storage.Blobs SDK. I'm using .Net 5 and console app.
using Azure.Storage.Blobs.Models;
using System;
using System.Collections.Generic;
using System.IO;
var contentTypes = new Dictionary<string, string>()
{
{".woff", "font/woff"},
{".woff2", "font/woff2" }
};
var cloudBlobClient = new BlobServiceClient("connectionstring");
var cloudBlobContainerClient = cloudBlobClient.GetBlobContainerClient("fonts");
await cloudBlobContainerClient.CreateIfNotExistsAsync();
var blobs = cloudBlobContainerClient.GetBlobsAsync();
await foreach (var blob in blobs)
{
var extension = Path.GetExtension(blob.Name);
contentTypes.TryGetValue(extension, out var contentType);
if (string.IsNullOrEmpty(contentType)) continue;
if (blob.Properties.ContentType == contentType)
{
continue;
}
try
{
// Get the existing properties
var blobClient = cloudBlobContainerClient.GetBlobClient(blob.Name);
var properties = await blobClient.GetPropertiesAsync();
var headers = new BlobHttpHeaders
{
ContentType = contentType,
CacheControl = properties.CacheControl,
ContentDisposition = properties.ContentDisposition,
ContentEncoding = properties.ContentEncoding,
ContentHash = properties.ContentHash,
ContentLanguage = properties.ContentLanguage
};
// Set the blob's properties.
await blobClient.SetHttpHeadersAsync(headers);
}
catch (RequestFailedException e)
{
Console.WriteLine($"HTTP error code {e.Status}: {e.ErrorCode}");
Console.WriteLine(e.Message);
Console.ReadLine();
}
}
The question is simple as stated in the title: Is there a way of having razor helpers outside of 'App_Code'?
Example ( HtmlEx.cshtml file ):
#helper Script(string fileName, UrlHelper url)
{
<script src="#url.Content("~/Scripts/" + fileName)" type="text/javascript"></script>
}
I ask this because I don't really have anything else to put in App_Code; I want to structure my project a bit different.
Thanks.
UPDATE: I don't want any other type of extensions. I am interested in only pure razor helpers as Scott is speaking about here: http://weblogs.asp.net/scottgu/archive/2011/05/12/asp-net-mvc-3-and-the-helper-syntax-within-razor.aspx
The question is simple as stated in the title: Is there a way of
having razor helpers outside of 'App_Code'?
No, there isn't.
Never Say Never...
Method One: (For use in a web application project)
Just add a pre-build event to copy your file into the App_Code folder.
(But since the file must probably be included in the project, you can add an empty file with the same name to the App_Code dir, and then have the build event to update it.)
(Note, that even if you put the file originally in the App_code folder you won't get intellisense until first time building, so it is anyway not a difference.)
Method Two: (for use in a class library, in which the startup project is a web application)
In a class library the App_Code folder is not anything special, so in order to be able to have the helper page global, we have to override the razor code, as it is hard coded to make global helpers only for code in the App_code folder.
Further more the razor code is designed so that for global helpers it creates a namespace based on the full path, something that you are probably not interested.
After all we remain with a problem, that there is no intellisense available, so to avoid all these problems, I have written the following code, assuming that:
Your .cshtml (or vbhtml) files are getting copied to the final projects output directory
You add a .cs (or .vb) file with the same name as the global helpers filename, and set it's build action to "compile", (this file will be autogenerated at startup to provide intellisense)
You have to register the PreApplicationStartupClass in the AssemblyInfo.cs file
You have to replace in the PreApplicationStartupCode.Start() method, to give the relative path to your global helpers page in the Bin folder, in the order of dependency (i.e. if one of the global helper files uses helpers in the other file then it should be listed after it).
In the CustomRazorCodeHost class you have to pick the correct method of PostProcessGeneratedCode() that is appropriate for the MVC version installed
Here is the code (but one will have to add the appropriate "using" statements):
[EditorBrowsable(EditorBrowsableState.Never)]
public static class PreApplicationStartCode
{
private static bool _startWasCalled;
public static void Start()
{
// Even though ASP.NET will only call each PreAppStart once, we sometimes internally call one PreAppStart from
// another PreAppStart to ensure that things get initialized in the right order. ASP.NET does not guarantee the
// order so we have to guard against multiple calls.
// All Start calls are made on same thread, so no lock needed here.
if (_startWasCalled)
{
return;
}
_startWasCalled = true;
//Add here the the global helpers based on dependency
//also note that each global helper should have a .cs file in the project with the same name
CustomRazorHelperBuildProvider bp = new CustomRazorHelperBuildProvider();
bp.VirtualPath = "~/Bin/path/to/helpers/file/Helpers.cshtml";
bp.GenerateCodeAndCompile();
bp = new CustomRazorHelperBuildProvider();
bp.VirtualPath = "~/Bin/path/to/helpers/file/DepndentHelpers.cshtml";
bp.GenerateCodeAndCompile();
}
}
public class CustomRazorHelperBuildProvider :RazorBuildProvider
{
static List<string> GeneratedAssemblyReferences = new List<string>();
public new string VirtualPath { get; set; }
protected override System.Web.WebPages.Razor.WebPageRazorHost CreateHost()
{
return new CustomCodeRazorHost(VirtualPath);
}
private WebPageRazorHost _host;
internal WebPageRazorHost Host
{
get
{
if (_host == null)
{
_host = CreateHost();
}
return _host;
}
}
private CodeCompileUnit _generatedCode = null;
internal CodeCompileUnit GeneratedCode
{
get
{
if (_generatedCode == null)
{
EnsureGeneratedCode();
}
return _generatedCode;
}
}
private CodeDomProvider _provider = null;
internal CodeDomProvider Provider
{
get
{
if(_provider == null)
{
_provider = GetProvider();
}
return _provider;
}
}
private void EnsureGeneratedCode()
{
RazorTemplateEngine engine = new RazorTemplateEngine(Host);
GeneratorResults results = null;
using (TextReader reader = OpenReader(VirtualPath))
{
results = engine.GenerateCode(reader, className: null, rootNamespace: null, sourceFileName: Host.PhysicalPath);
}
if (!results.Success)
{
RazorError error = results.ParserErrors.Last();
throw new HttpParseException(error.Message + Environment.NewLine, null, VirtualPath, null, error.Location.LineIndex + 1);
}
_generatedCode = results.GeneratedCode;
}
private CodeDomProvider GetProvider()
{
CompilerType compilerType = GetDefaultCompilerTypeForLanguage(Host.CodeLanguage.LanguageName);
CodeDomProvider provider = CreateCodeDomProviderWithPropertyOptions(compilerType.CodeDomProviderType);
return provider;
}
/// <summary>
/// Generates the c# (or vb.net) code, for the intellisense to work
/// </summary>
public void GenerateCode()
{
//Remember that if there is a razor error, then the next time the project will not compile at all, because the generated .cs file will also have the error!
//The solution is to add a pre-build event to truncate the file, but not remove it!, also note that the pre-build event will not work in time if the .cs file is open in the VS editor!
string filePath = VirtualPath.Replace("/", "\\").Replace("~\\Bin", "").Replace("\\Debug", "").Replace("\\Release", "");
filePath = filePath.Remove(filePath.Length - 4);
//filePath = filePath.Insert(filePath.LastIndexOf("\\"), "\\HelperAutoGeneratedCode");
Assembly curAssem = Assembly.GetExecutingAssembly();
filePath = HttpRuntime.AppDomainAppPath + "\\..\\" + curAssem.GetName().Name + filePath;
using (FileStream fs = new FileStream(filePath, FileMode.Truncate))
{
using (StreamWriter sw = new StreamWriter(fs))
{
Provider.GenerateCodeFromCompileUnit(GeneratedCode, sw, null);
sw.Flush();
sw.Close();
}
fs.Close();
}
//We need to replace the type of the helpers from "HelperResult" to object, otherwise the intellisense will complain that "it can't convert from HelperResult to object"
string text = File.ReadAllText(filePath);
text = text.Replace("public static System.Web.WebPages.HelperResult ", "public static object ");
File.WriteAllText(filePath, text);
}
public void GenerateCodeAndCompile()
{
GenerateCode();
Compile();
}
/// <summary>
/// Compiles the helper pages for use at runtime
/// </summary>
/// <returns>Compiler Result</returns>
public CompilerResults Compile()
{
Assembly assem = Assembly.GetExecutingAssembly();
AssemblyName[] references = assem.GetReferencedAssemblies();
List<string> referenceNames = references.Select(r => Assembly.ReflectionOnlyLoad(r.FullName).Location).ToList();
referenceNames.Add(assem.Location);
//Add here references that are not included in the project, but are needed for the generated assembly, you can see this through the results.Errors
referenceNames.Add((typeof(WebMatrix.Data.ConnectionEventArgs).Assembly.Location));
referenceNames.Add((typeof(WebMatrix.WebData.SimpleRoleProvider).Assembly.Location));
if (GeneratedAssemblyReferences != null && GeneratedAssemblyReferences.Count > 0)
{
referenceNames.AddRange(GeneratedAssemblyReferences);
}
CompilerResults results = Provider.CompileAssemblyFromDom(new CompilerParameters(referenceNames.ToArray()), new CodeCompileUnit[] { GeneratedCode });
if (results.Errors.HasErrors)
{
IEnumerator en = results.Errors.GetEnumerator();
en.MoveNext();
CompilerError error = en.Current as CompilerError;
throw new HttpParseException(error.ErrorText + Environment.NewLine, null, VirtualPath, null, error.Line);
}
Assembly assemblyRef = GetGeneratedType(results).Assembly;
GeneratedAssemblyReferences.Add(assemblyRef.Location); //So that any subsequent helper page that is dependent on it will have it as a reference
//We need to make it available for Razor, so it will work with reguler razor pages at runtime
RazorBuildProvider.CodeGenerationStarted += new EventHandler((sender, args) => (sender as RazorBuildProvider).AssemblyBuilder.AddCodeCompileUnit(this, GeneratedCode));
return results;
}
private static CodeDomProvider CreateCodeDomProviderWithPropertyOptions(Type codeDomProviderType)
{
// The following resembles the code in System.CodeDom.CompilerInfo.CreateProvider
// Make a copy to avoid modifying the original.
var originalProviderOptions = GetProviderOptions(codeDomProviderType);
IDictionary<string, string> providerOptions = null;
if (originalProviderOptions != null)
{
providerOptions = new Dictionary<string, string>(originalProviderOptions);
}
AssemblyName[] references = Assembly.GetExecutingAssembly().GetReferencedAssemblies();
foreach (AssemblyName reference in references)
{
if (reference.Name == "mscorlib")
{
providerOptions["CompilerVersion"] = "v" + reference.Version.Major + "." + reference.Version.Minor;
break;
}
}
if (providerOptions != null && providerOptions.Count > 0)
{
ConstructorInfo ci = codeDomProviderType.GetConstructor(new Type[] { typeof(IDictionary<string, string>) });
CodeDomProvider provider = null;
if (ci != null)
{
// First, obtain the language for the given codedom provider type.
CodeDomProvider defaultProvider = (CodeDomProvider)Activator.CreateInstance(codeDomProviderType);
string extension = defaultProvider.FileExtension;
// Then, use the new createProvider API to create an instance.
provider = CodeDomProvider.CreateProvider(extension, providerOptions);
}
return provider;
}
return null;
}
internal static IDictionary<string, string> GetProviderOptions(Type codeDomProviderType)
{
// Using reflection to get the property for the time being.
// This could simply return CompilerInfo.PropertyOptions if it goes public in future.
CodeDomProvider provider = (CodeDomProvider)Activator.CreateInstance(codeDomProviderType);
string extension = provider.FileExtension;
if (CodeDomProvider.IsDefinedExtension(extension))
{
CompilerInfo ci = CodeDomProvider.GetCompilerInfo(CodeDomProvider.GetLanguageFromExtension(extension));
PropertyInfo pi = ci.GetType().GetProperty("ProviderOptions",
BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.IgnoreCase | BindingFlags.Instance);
if (pi != null)
return (IDictionary<string, string>)pi.GetValue(ci, null);
return null;
}
return null;
}
}
public class CustomCodeRazorHost : WebPageRazorHost
{
internal const string ApplicationInstancePropertyName = "ApplicationInstance";
internal const string ContextPropertyName = "Context";
internal const string WebDefaultNamespace = "ASP";
private static readonly string _helperPageBaseType = typeof(HelperPage).FullName;
public CustomCodeRazorHost(string virtualPath)
: base(virtualPath)
{
DefaultBaseClass = _helperPageBaseType;
DefaultNamespace = WebDefaultNamespace;
DefaultDebugCompilation = false;
StaticHelpers = true;
}
//Version for MVC 3
public override void PostProcessGeneratedCode(CodeCompileUnit codeCompileUnit, CodeNamespace generatedNamespace, CodeTypeDeclaration generatedClass, CodeMemberMethod executeMethod)
{
// Add additional global imports
generatedNamespace.Imports.AddRange(GetGlobalImports().Select(s => new CodeNamespaceImport(s)).ToArray());
// Create ApplicationInstance property
CodeMemberProperty prop = new CodeMemberProperty()
{
Name = ApplicationInstancePropertyName,
Type = new CodeTypeReference(typeof(HttpApplication).FullName),
HasGet = true,
HasSet = false,
Attributes = MemberAttributes.Family | MemberAttributes.Final
};
prop.GetStatements.Add(
new CodeMethodReturnStatement(
new CodeCastExpression(
new CodeTypeReference(typeof(HttpApplication).FullName),
new CodePropertyReferenceExpression(
new CodePropertyReferenceExpression(
null,
ContextPropertyName),
ApplicationInstancePropertyName))));
generatedClass.Members.Insert(0, prop);
// Yank out the execute method (ignored in Razor Web Code pages)
generatedClass.Members.Remove(executeMethod);
// Make ApplicationInstance static
CodeMemberProperty appInstanceProperty =
generatedClass.Members
.OfType<CodeMemberProperty>()
.Where(p => ApplicationInstancePropertyName
.Equals(p.Name))
.SingleOrDefault();
if (appInstanceProperty != null)
{
appInstanceProperty.Attributes |= MemberAttributes.Static;
}
}
//Version for MVC 4
public override void PostProcessGeneratedCode(CodeGeneratorContext context)
{
// Add additional global imports
context.Namespace.Imports.AddRange(GetGlobalImports().Select(s => new CodeNamespaceImport(s)).ToArray());
// Create ApplicationInstance property
CodeMemberProperty prop = new CodeMemberProperty()
{
Name = ApplicationInstancePropertyName,
Type = new CodeTypeReference(typeof(HttpApplication).FullName),
HasGet = true,
HasSet = false,
Attributes = MemberAttributes.Family | MemberAttributes.Final
};
prop.GetStatements.Add(
new CodeMethodReturnStatement(
new CodeCastExpression(
new CodeTypeReference(typeof(HttpApplication).FullName),
new CodePropertyReferenceExpression(
new CodePropertyReferenceExpression(
null,
ContextPropertyName),
ApplicationInstancePropertyName))));
context.GeneratedClass.Members.Insert(0, prop);
// Yank out the execute method (ignored in Razor Web Code pages)
context.GeneratedClass.Members.Remove(context.TargetMethod);
// Make ApplicationInstance static
CodeMemberProperty appInstanceProperty =
context.GeneratedClass.Members
.OfType<CodeMemberProperty>()
.Where(p => ApplicationInstancePropertyName
.Equals(p.Name))
.SingleOrDefault();
if (appInstanceProperty != null)
{
appInstanceProperty.Attributes |= MemberAttributes.Static;
}
}
protected override string GetClassName(string virtualPath)
{
return ParserHelpers.SanitizeClassName(Path.GetFileNameWithoutExtension(virtualPath));
}
}
But note that if there is a syntax error in the .cshtml file, you will have problems to compile next time (as the generated .cs file will have compile errors), however visual studio apparently has problems to pinpoint the problem.
Also sometimes the compiled code from the last build (compiled from the .cs file), can sometimes conflict with the newly updated .cshtml file.
Therefore I would recommend to add a pre-build event to truncate the file
echo. > $(ProjectDir)\Path\to\.cs\file
you can go more sophisticated and do it only if the .cshtml file has been changed (and this also applies to the code I have written above).
Use the Razor Generator extension on a view with helpers inside and you'll generate the code for the view before compilation time. The generated view code is part of your project and compiles into the assembly, so you can place the view file anywhere and use the helpers anywhere, even from a unit test.
sure, you can put them anywhere in your code or project structure. in the file where you create your helper be sure to include using System.Web.Mvc.
then just normally extend the Helper class like this:
namespace System.Web.Mvc
{
static class HtmlHelperExtensions
{
public static IHtmlString MyNewHelper(this HtmlHelper helper, string someParam)
{
// do something
}
}
}