IronPython (ScriptEngine) is not thread safe? - thread-safety
I've met an issue when trying to use multiple ScriptEngine instances in parallel, since there's no information saying that a single ScriptEngine instance could be used concurrently. Please note "thread-safe" is not enough for me. What I need is the real parallelized execution in multiple threads, so I'm trying to use separated ScriptEngine instances in different threads.
Here's code I've used for testing.
private const string PythonStandardLibPath = #"C:\python.standard.lib";
private const string Script = #"
import collections
import os";
private static void ExecuteOne(int i)
{
var engine = Python.CreateEngine();
engine.SetSearchPaths(new[] { PythonStandardLibPath });
var scope = engine.CreateScope();
try
{
engine.Execute(Script, scope);
Console.WriteLine("Executed: " + i);
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
}
private static void Main()
{
for (var i = 0; i < 3; i++)
{
var id = i;
Task.Factory.StartNew(() => ExecuteOne(id) );
}
Console.WriteLine("Started");
Console.ReadLine();
}
When I run the application, there's an exception thrown like:
System.IndexOutOfRangeException: Index was outside the bounds of the array.
at System.Collections.Generic.List`1.Add(T item)
at IronPython.Runtime.WeakRefTracker.ChainCallback(Object callback, Object weakRef)
at IronPython.Modules.PythonWeakRef.WeakRefHelpers.InitializeWeakRef(Object self, Object target, Object callback)
at IronPython.Modules.PythonWeakRef.ref..ctor(Object object, Object callback)
at IronPython.Modules.PythonWeakRef.ref.__new__(CodeContext context, PythonType cls, Object object, Object callback)
at Microsoft.Scripting.Interpreter.FuncCallInstruction`5.Run(InterpretedFrame frame)
at Microsoft.Scripting.Interpreter.Interpreter.Run(InterpretedFrame frame)
at Microsoft.Scripting.Interpreter.LightLambda.Run5[T0,T1,T2,T3,T4,TRet](T0 arg0, T1 arg1, T2 arg2, T3 arg3, T4 arg4)
at System.Dynamic.UpdateDelegates.UpdateAndExecute4[T0,T1,T2,T3,TRet](CallSite site, T0 arg0, T1 arg1, T2 arg2, T3 arg3)
at Microsoft.Scripting.Interpreter.FuncCallInstruction`7.Run(InterpretedFrame frame)
at Microsoft.Scripting.Interpreter.Interpreter.Run(InterpretedFrame frame)
at Microsoft.Scripting.Interpreter.LightLambda.Run5[T0,T1,T2,T3,T4,TRet](T0 arg0, T1 arg1, T2 arg2, T3 arg3, T4 arg4)
at IronPython.Compiler.Ast.CallExpression.Invoke2Instruction.Run(InterpretedFrame frame)
at Microsoft.Scripting.Interpreter.Interpreter.Run(InterpretedFrame frame)
at Microsoft.Scripting.Interpreter.LightLambda.Run3[T0,T1,T2,TRet](T0 arg0, T1 arg1, T2 arg2)
at IronPython.Runtime.FunctionCaller`2.Call2(CallSite site, CodeContext context, Object func, T0 arg0, T1 arg1)
at IronPython.Runtime.Method.MethodBinding`1.SelfTarget(CallSite site, CodeContext context, Object target, T0 arg0)
at System.Dynamic.UpdateDelegates.UpdateAndExecute3[T0,T1,T2,TRet](CallSite site, T0 arg0, T1 arg1, T2 arg2)
at Microsoft.Scripting.Interpreter.FuncCallInstruction`6.Run(InterpretedFrame frame)
at Microsoft.Scripting.Interpreter.Interpreter.Run(InterpretedFrame frame)
at Microsoft.Scripting.Interpreter.LightLambda.Run4[T0,T1,T2,T3,TRet](T0 arg0, T1 arg1, T2 arg2, T3 arg3)
at IronPython.Compiler.Ast.CallExpression.Invoke1Instruction.Run(InterpretedFrame frame)
at Microsoft.Scripting.Interpreter.Interpreter.Run(InterpretedFrame frame)
at Microsoft.Scripting.Interpreter.LightLambda.Run3[T0,T1,T2,TRet](T0 arg0, T1 arg1, T2 arg2)
at IronPython.Compiler.PythonCallTargets.OriginalCallTarget2(PythonFunction function, Object arg0, Object arg1)
at IronPython.Runtime.FunctionCaller`2.Call2(CallSite site, CodeContext context, Object func, T0 arg0, T1 arg1)
at System.Dynamic.UpdateDelegates.UpdateAndExecute4[T0,T1,T2,T3,TRet](CallSite site, T0 arg0, T1 arg1, T2 arg2, T3 arg3)
at IronPython.Runtime.Method.MethodBinding`1.SelfTarget(CallSite site, CodeContext context, Object target, T0 arg0)
at System.Dynamic.UpdateDelegates.UpdateAndExecute3[T0,T1,T2,TRet](CallSite site, T0 arg0, T1 arg1, T2 arg2)
at Microsoft.Scripting.Interpreter.FuncCallInstruction`6.Run(InterpretedFrame frame)
at Microsoft.Scripting.Interpreter.Interpreter.Run(InterpretedFrame frame)
at Microsoft.Scripting.Interpreter.LightLambda.Run4[T0,T1,T2,T3,TRet](T0 arg0, T1 arg1, T2 arg2, T3 arg3)
at IronPython.Compiler.Ast.CallExpression.Invoke1Instruction.Run(InterpretedFrame frame)
at Microsoft.Scripting.Interpreter.Interpreter.Run(InterpretedFrame frame)
at Microsoft.Scripting.Interpreter.LightLambda.Run1[T0,TRet](T0 arg0)
at IronPython.Compiler.RuntimeScriptCode.InvokeTarget(Scope scope)
at IronPython.Compiler.RuntimeScriptCode.Run(Scope scope)
at IronPython.Runtime.PythonContext.InitializeModule(String fileName, ModuleContext moduleContext, ScriptCode scriptCode, ModuleOptions options)
at IronPython.Runtime.PythonContext.CompileModule(String fileName, String moduleName, SourceUnit sourceCode, ModuleOptions options, ScriptCode& scriptCode)
at IronPython.Runtime.PythonContext.CompileModule(String fileName, String moduleName, SourceUnit sourceCode, ModuleOptions options)
at IronPython.Runtime.Importer.LoadFromSourceUnit(CodeContext context, SourceUnit sourceCode, String name, String path)
at IronPython.Runtime.Importer.LoadModuleFromSource(CodeContext context, String name, String path)
at IronPython.Runtime.Importer.LoadFromDisk(CodeContext context, String name, String fullName, String str)
at IronPython.Runtime.Importer.ImportFromPathHook(CodeContext context, String name, String fullName, List path, Func`5 defaultLoader)
at IronPython.Runtime.Importer.ImportFromPath(CodeContext context, String name, String fullName, List path)
at IronPython.Runtime.Importer.ImportTopAbsolute(CodeContext context, String name)
at IronPython.Runtime.Importer.ImportModule(CodeContext context, Object globals, String modName, Boolean bottom, Int32 level)
at IronPython.Modules.Builtin.__import__(CodeContext context, String name, Object globals, Object locals, Object fromlist, Int32 level)
at Microsoft.Scripting.Interpreter.FuncCallInstruction`7.Run(InterpretedFrame frame)
at Microsoft.Scripting.Interpreter.Interpreter.Run(InterpretedFrame frame)
at Microsoft.Scripting.Interpreter.LightLambda.Run7[T0,T1,T2,T3,T4,T5,T6,TRet](T0 arg0, T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6)
at IronPython.Runtime.Importer.ImportLightThrow(CodeContext context, String fullName, PythonTuple from, Int32 level)
at IronPython.Runtime.Importer.Import(CodeContext context, String fullName, PythonTuple from, Int32 level)
at IronPython.Runtime.Operations.PythonOps.ImportStar(CodeContext context, String fullName, Int32 level)
at Microsoft.Scripting.Interpreter.ActionCallInstruction`3.Run(InterpretedFrame frame)
at Microsoft.Scripting.Interpreter.Interpreter.Run(InterpretedFrame frame)
at Microsoft.Scripting.Interpreter.LightLambda.Run1[T0,TRet](T0 arg0)
at IronPython.Compiler.RuntimeScriptCode.InvokeTarget(Scope scope)
at IronPython.Compiler.RuntimeScriptCode.Run(Scope scope)
at IronPython.Runtime.PythonContext.InitializeModule(String fileName, ModuleContext moduleContext, ScriptCode scriptCode, ModuleOptions options)
at IronPython.Runtime.PythonContext.CompileModule(String fileName, String moduleName, SourceUnit sourceCode, ModuleOptions options, ScriptCode& scriptCode)
at IronPython.Runtime.PythonContext.CompileModule(String fileName, String moduleName, SourceUnit sourceCode, ModuleOptions options)
at IronPython.Runtime.Importer.LoadFromSourceUnit(CodeContext context, SourceUnit sourceCode, String name, String path)
at IronPython.Runtime.Importer.LoadModuleFromSource(CodeContext context, String name, String path)
at IronPython.Runtime.Importer.LoadFromDisk(CodeContext context, String name, String fullName, String str)
at IronPython.Runtime.Importer.ImportFromPathHook(CodeContext context, String name, String fullName, List path, Func`5 defaultLoader)
at IronPython.Runtime.Importer.ImportFromPath(CodeContext context, String name, String fullName, List path)
at IronPython.Runtime.Importer.ImportTopAbsolute(CodeContext context, String name)
at IronPython.Runtime.Importer.ImportModule(CodeContext context, Object globals, String modName, Boolean bottom, Int32 level)
at IronPython.Modules.Builtin.__import__(CodeContext context, String name, Object globals, Object locals, Object fromlist, Int32 level)
at Microsoft.Scripting.Interpreter.FuncCallInstruction`7.Run(InterpretedFrame frame)
at Microsoft.Scripting.Interpreter.Interpreter.Run(InterpretedFrame frame)
at Microsoft.Scripting.Interpreter.LightLambda.Run7[T0,T1,T2,T3,T4,T5,T6,TRet](T0 arg0, T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6)
at System.Dynamic.UpdateDelegates.UpdateAndExecute6[T0,T1,T2,T3,T4,T5,TRet](CallSite site, T0 arg0, T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5)
at IronPython.Runtime.Importer.ImportLightThrow(CodeContext context, String fullName, PythonTuple from, Int32 level)
at IronPython.Runtime.Operations.PythonOps.ImportTop(CodeContext context, String fullName, Int32 level)
at Microsoft.Scripting.Interpreter.FuncCallInstruction`4.Run(InterpretedFrame frame)
at Microsoft.Scripting.Interpreter.Interpreter.Run(InterpretedFrame frame)
at Microsoft.Scripting.Interpreter.LightLambda.Run2[T0,T1,TRet](T0 arg0, T1 arg1)
at IronPython.Compiler.PythonScriptCode.RunWorker(CodeContext ctx)
at IronPython.Compiler.PythonScriptCode.Run(Scope scope)
at IronPython.Compiler.RuntimeScriptCode.InvokeTarget(Scope scope)
at IronPython.Compiler.RuntimeScriptCode.Run(Scope scope)
at Microsoft.Scripting.SourceUnit.Execute(Scope scope, ErrorSink errorSink)
at Microsoft.Scripting.SourceUnit.Execute(Scope scope)
at Microsoft.Scripting.Hosting.ScriptSource.Execute(ScriptScope scope)
at Microsoft.Scripting.Hosting.ScriptEngine.Execute(String expression, ScriptScope scope)
at CSharpConsole.Program.ExecuteOne(Int32 i) in c:\projects\CSharpConsole\CSharpConsole\Program.cs:line 200
The exception might not be the same in each run, but it's always a List<T> operation indicates a threading issue. Another exception happens on a background thread after a while. I believe it's a cleaning up task.
System.ArgumentException: Source array was not long enough. Check srcIndex and length, and the array's lower bounds.
at System.Array.Copy(Array sourceArray, Int32 sourceIndex, Array destinationArray, Int32 destinationIndex, Int32 length, Boolean reliable)
at System.Collections.Generic.List`1.RemoveAt(Int32 index)
at IronPython.Runtime.WeakRefTracker.RemoveHandlerAt(Int32 index)
at IronPython.Runtime.WeakRefTracker.RemoveHandler(Object o)
at IronPython.Modules.PythonWeakRef.ref.Finalize()
Is there a good way to make it work besides locking everywhere?
Related
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Numeric Filter - need it to accept decimal point?
I lifted a Numeric Filter from here,
but it isn't quite what I need, it will not allow the input of a single Decimal point,
This filter looks like this
DocumentFilter numericFilter = new DocumentFilter(){
#Override
public void insertString(DocumentFilter.FilterBypass fb, int offset,
String string, AttributeSet attr)
throws BadLocationException {
fb.insertString(offset, string.replaceAll("[^\\d]", ""), attr);
}
#Override
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String text, AttributeSet attrs)
throws BadLocationException {
fb.replace(offset, length, text.replaceAll("[^\\d]", ""), attrs);
}
};
How can I alter this so it will allow the single inclusion of a decimal point?
thanks,
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Void means(V is capital)
getJdbcTemplate().query(getFileContentSql, new RowMapper<Void>() {
public void mapRow(ResultSet rs, int rowNum) throws SQLException {
OracleLobHandler lobHandler = new OracleLobHandler();
InputStream inputStream = lobHandler.getBlobAsBinaryStream(rs, "file_content");
ExlImporter importer = new ExlBOMImporter(inputStream);
importer.process();
}
}, fileId);
Please tell me what is Void ?
Note : V is capital.
Form the javadoc: The Void class is an uninstantiable placeholder class to hold a reference to the Class object representing the Java keyword void.
hadoop input data problems
I'm having trouble with the map functions:
The original data is stored in the tsv file:
I just want the last two columns saved:
the first is the original node(383), second is the target(4575), third is the weight(1)
383 4575 1
383 4764 1
383 5458 1
383 5491 1
public void map(LongWritable key, Text value,OutputCollector output, Reporter reporter) throws IOException {
String line = value.toString();
String[] tokens = line.split("t");
int weight = Integer.parseInt(tokens[2]);
int target = Integer.parseInt(tokens[0]);
}
Here is my code:
public void map(LongWritable key, Text value, Context context) throws IOException InterruptedException
{
String line = value.toString();
//split the tsv file
String[] tokens = line.split("/t");
//save the weight and target
private Text target = Integer.parsetxt(tokens[0]);
int weight = Integer.parseInt(tokens[2]);
context.write(new Text(target), new Intwritable(weight) );
}
}
public class Reduce extends Reducer<Text, IntWritable, Text, IntWritable>
{
#Override
public void reduce(Text key, Iterable<IntWritable> values,Context context)
throws IOException, InterruptedException
{
//initialize the count variable
int weightsum = 0;
for (IntWritable value : values) {
weightsum += value.get();
}
context.write(key, new IntWritable(weightsum));
}
}
String[] tokens = line.split("t");
should be
String[] tokens = line.split("\t");
split with spaces.
String[] tokens = line.split("\\s+");
private Text target = Integer.parsetxt(tokens[1]);
int weight = Integer.parseInt(tokens[2]);
Optional Dictionary Parameter in MVC 3 Controller Action
I had an MVC 3 controller action defined like this: public ActionResult _UpdateFilter(int a, string b, List<string> c) that worked great. There's a new requirement to sometimes also send a Dictionary<int, bool> to the action, depending on user action in the UI. To populate that dictionary, I add hidden fields to the appropriate form like this: <input type="hidden" id="id-#(something)-Key" name="sometimesSet[#(idx)].Key" value="#(myIntValue)" /> <input type="hidden" id="id-#(something)-Value" name="sometimesSet[#(idx)].Value" value="#(myBoolValue)" /> and I extended my Controller Action like this: public ActionResult _UpdateFilter(int a, string b, List<string> c, Dictionary<int, bool> sometimesSet = null) So far, so good. As long as I populate at least one hidden key/value pair in the form. If I do not, my Action is not invoked and I get the exception: Value cannot be null. Parameter name: key (long stack trace at end of question). The Question I gather the route mapping can't figure out that sometimesSet is optional, but I don't know how to configure that properly. How do I do that? I have not edited the route definitions in Global.asax. The stack trace at System.Collections.Generic.Dictionary`2.FindEntry(TKey key) at System.Collections.Generic.Dictionary`2.ContainsKey(TKey key) at System.Web.Mvc.ValueProviderUtil.GetKeysFromPrefix(IEnumerable`1 collection, String prefix) at System.Web.Mvc.DictionaryValueProvider`1.GetKeysFromPrefix(String prefix) at System.Web.Mvc.ValueProviderCollection.GetKeysFromPrefixFromProvider(IValueProvider provider, String prefix) at System.Web.Mvc.ValueProviderCollection.<>c__DisplayClass11.<GetKeysFromPrefix>b__c(IValueProvider provider) at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext() at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext() at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source) at System.Web.Mvc.ValueProviderCollection.GetKeysFromPrefix(String prefix) at System.Web.Mvc.DefaultModelBinder.UpdateDictionary(ControllerContext controllerContext, ModelBindingContext bindingContext, Type keyType, Type valueType) at System.Web.Mvc.DefaultModelBinder.BindComplexModel(ControllerContext controllerContext, ModelBindingContext bindingContext) at System.Web.Mvc.DefaultModelBinder.BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext) at System.Web.Mvc.ControllerActionInvoker.GetParameterValue(ControllerContext controllerContext, ParameterDescriptor parameterDescriptor) at System.Web.Mvc.ControllerActionInvoker.GetParameterValues(ControllerContext controllerContext, ActionDescriptor actionDescriptor) at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass25.<BeginInvokeAction>b__1e(AsyncCallback asyncCallback, Object asyncState) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`1.Begin(AsyncCallback callback, Object state, Int32 timeout) at System.Web.Mvc.Async.AsyncControllerActionInvoker.BeginInvokeAction(ControllerContext controllerContext, String actionName, AsyncCallback callback, Object state) at System.Web.Mvc.Controller.<>c__DisplayClass1d.<BeginExecuteCore>b__17(AsyncCallback asyncCallback, Object asyncState) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`1.Begin(AsyncCallback callback, Object state, Int32 timeout) at System.Web.Mvc.Controller.BeginExecuteCore(AsyncCallback callback, Object state) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`1.Begin(AsyncCallback callback, Object state, Int32 timeout) at System.Web.Mvc.Controller.BeginExecute(RequestContext requestContext, AsyncCallback callback, Object state) at System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.BeginExecute(RequestContext requestContext, AsyncCallback callback, Object state) at System.Web.Mvc.MvcHandler.<>c__DisplayClass6.<>c__DisplayClassb.<BeginProcessRequest>b__3(AsyncCallback asyncCallback, Object asyncState) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`1.Begin(AsyncCallback callback, Object state, Int32 timeout) at System.Web.Mvc.MvcHandler.<>c__DisplayClass6.<BeginProcessRequest>b__2() at System.Web.Mvc.SecurityUtil.<>c__DisplayClassb`1.<ProcessInApplicationTrust>b__a() at System.Web.Mvc.SecurityUtil.<GetCallInAppTrustThunk>b__0(Action f) at System.Web.Mvc.SecurityUtil.ProcessInApplicationTrust(Action action) at System.Web.Mvc.SecurityUtil.ProcessInApplicationTrust[TResult](Func`1 func) at System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContextBase httpContext, AsyncCallback callback, Object state) at System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContext httpContext, AsyncCallback callback, Object state) at System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.BeginProcessRequest(HttpContext context, AsyncCallback cb, Object extraData) at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
I found the cleanest solution is to implement my own ModelBinder that understands how to populate a Dictionary<K,V> even if no relevant values are found on the wire (it will return an empty Dictionary<K,V>.
Here's the code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
namespace My.ModelBinders
{
/// <summary>
/// Binds to a generic Dictionary using the basic format outlined at
/// http://www.hanselman.com/blog/ASPNETWireFormatForModelBindingToArraysListsCollectionsDictionaries.aspx
/// with the relaxation that the indices can be arbitrary integers (need not start at 0 or be sequential).
/// Returns an empty dictionary of no matching parameters found on the wire rather than throwing
/// an Exception as the current default binder does.
/// </summary>
/// <typeparam name="K">Key type</typeparam>
/// <typeparam name="V">Value type</typeparam>
public class OptionalDictionaryBinder<K,V> : CustomBinderBase, IModelBinder
{
/// <summary>
/// Pull key/value pairs out of request. Modified from
/// https://github.com/loune/MVCStuff/blob/master/Extensions/DefaultDictionaryBinder.cs
/// Files not currently supported.
/// </summary>
/// <param name="context"></param>
/// <returns></returns>
private IEnumerable<KeyValuePair<string, string>> GetValueProviderData(ControllerContext context)
{
foreach (var fk in context.HttpContext.Request.Form.Keys)
{
yield return new KeyValuePair<string, string>((string)fk, context.HttpContext.Request.Form[(string)fk]);
}
foreach (var rd in context.RouteData.Values)
{
yield return new KeyValuePair<string, string>(rd.Key, (string)rd.Value);
}
foreach (var qp in context.HttpContext.Request.QueryString)
{
yield return new KeyValuePair<string, string>((string)qp, context.HttpContext.Request.QueryString[(string)qp]);
}
}
public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
{
if (controllerContext == null)
{
throw new ArgumentNullException("controllerContext");
}
if (bindingContext == null)
{
throw new ArgumentNullException("bindingContext");
}
Dictionary<K, V> dict = new Dictionary<K, V>();
Dictionary<int, K> keys = new Dictionary<int, K>();
Dictionary<int, V> values = new Dictionary<int, V>();
foreach (KeyValuePair<string,string> formParam in GetValueProviderData(controllerContext))
{
if (formParam.Key.StartsWith(bindingContext.ModelName, StringComparison.InvariantCultureIgnoreCase))
{
int startbracket = formParam.Key.IndexOf("[");
if (startbracket != bindingContext.ModelName.Length) throw new Exception("Did not find [ directly after model name");
int endbracket = formParam.Key.IndexOf("]", bindingContext.ModelName.Length + 1);
if (endbracket == -1) throw new Exception("Did not find closing bracket in " + formParam);
int idx;
string idxText = formParam.Key.Substring(bindingContext.ModelName.Length + 1, endbracket - bindingContext.ModelName.Length - 1);
if (!int.TryParse(idxText, out idx))
{
throw new Exception("Could not parse numeric index from " + formParam);
}
if (formParam.Key.EndsWith(".Key", StringComparison.InvariantCultureIgnoreCase))
{
if (keys.ContainsKey(idx))
{
throw new Exception("The index " + idx + " was repeated.");
}
K dictKey;
try
{
dictKey = (K)Convert.ChangeType(formParam.Value, typeof(K));
keys.Add(idx, dictKey);
}
catch (NotSupportedException)
{
throw new Exception("The given key '" + formParam.Key + "' could not be converted to type K");
}
}
else if (formParam.Key.EndsWith(".Value", StringComparison.InvariantCultureIgnoreCase))
{
if (values.ContainsKey(idx))
{
throw new Exception("The index " + idx + " was repeated.");
}
V dictValue;
try
{
dictValue = (V)Convert.ChangeType(formParam.Value, typeof(V));
values.Add(idx, dictValue);
}
catch (NotSupportedException)
{
throw new Exception("The given value '" + formParam.Value + "' could not be converted to type V");
}
}
}
}
if (!keys.Keys.SequenceEqual(values.Keys))
{
throw new Exception("Keys and values do not match.");
}
foreach (KeyValuePair<int, K> kvp in keys)
{
dict.Add(kvp.Value, values[kvp.Key]);
}
return dict;
}
}
}
Usage:
public ActionResult _UpdateFilter(int a, string b, List<string> c,
[ModelBinder(typeof(OptionalDictionaryBinder<int, bool>))]
Dictionary<int, bool> sometimesSet)