I made a scatter chart with VS C# 2022 using SpreadsheetLight library.
First column is DateTime, it doesn't show as Time in chart, any hint will be appreciated very much, as I have been for days with this problem.
Here's my code:
private void Scatter_Click(object sender, EventArgs e)
{
int C;
SLDocument sl = new SLDocument();
SLStyle s_Time = sl.CreateStyle();
s_Time.SetVerticalAlignment(VerticalAlignmentValues.Center);
s_Time.SetHorizontalAlignment(HorizontalAlignmentValues.Center);
s_Time.FormatCode = "HH:MM:SS";
SLTextImportOptions csv = new SLTextImportOptions();
csv.UseCommaDelimiter = true;
sl.ImportText("C:\\test.csv", "A1", csv);
for (C = 2; C < 10; C++)
{
sl.SetCellStyle(C,1,s_Time);
}
SLChart chart;
chart = sl.CreateChart("A1", "C9");
chart.SetChartType(SLScatterChartType.ScatterWithSmoothLinesAndMarkers);
chart.SetChartStyle(SLChartStyle.Style2);
chart.PrimaryValueAxis.FormatCode = "HH:MM:SS";
chart.SetChartPosition(2,5,22,16);
sl.InsertChart(chart);
sl.SaveAs("C:\\Scatter.xlsx");
Close();
}
Here is my csv file content:
"Hours","Col 1","Col 2"
05:06:07,35.6,25.3
06:07:08,38.2,28.4
07:08:09,41.6,26.9
08:09:10,39.8,28.1
09:10:11,43.4,26.7
10:11:12,40.2,29.6
11:12:13,38.9,26.1
12:13:14,38.7,27.6
Related
I want to get the data of PresAddress column in SQLite Database. I want to get the "PresAddress" column data and bind that data to my entry field. PresAddress is inside tblContacts. How can I get that?
Here is my code:
private void rcodePicker_SelectedIndexChanged(object sender, EventArgs e)
{
var pickedRetailerCode = rcodePicker.Items[rcodePicker.SelectedIndex];
var db = DependencyService.Get<ISQLiteDB>();
var conn = db.GetConnection();
var getUser = conn.QueryAsync<ContactsTable>("SELECT * FROM tblContacts WHERE ContactID=?", pickedRetailerCode);
var resultCount = getUser.Result.Count;
if (resultCount < 1)
{
//MessagingCenter.Send(this, "Http", Retailer);
}
else
{
var result = getUser.Result;
entStreet.Text = ;
}
}
Use this:
for (int i = 0; i < resultCount; i++)
{
var result = getUser.Result[i];
entStreet.Text = result.PresAddress;
entBarangay.Text = result.PresBarangay;
entCity.Text = result.PresTown;
entProvince.Text = result.PresProvince;
entDistributor.Text = result.PresDistrict;
}
I have a cross platform app which I need to show a set of images when the user clic in a button, so, I put these image files named as "img000.png" to "img029.png" in a folder in the PCL solution and make al these images as "EmbeddedResource", after,I fill a List with all these images and its work fine at now, i.e. the image is shown like I want, but when I click in the button to show the next image in the list the image don't go to the next.
I have this:
//...
public class ImageSetPage : BasePage
// BasePage encapsule a ContentPage...
{
private string directory = "MyApp.Assets.";
private int idx = 0;
protected StackLayout _mainLayout;
protected StackLayout _buttonStack;
protected Image _btnPrevI;
protected Label _displayName;
protected Image _btnNestI;
protected Image _image;
protected List<Image> _Images;
public ImageSetPage()
{
this._Images = getImages();
var prevI_Tap = new TapGestureRecognizer();
prevI_Tap.Tapped += (s, e) =>
{
onClick("pvi");
};
var nextI_Tap = new TapGestureRecognizer();
nextI_Tap.Tapped += (s, e) =>
{
onClick("nti");
};
/// begin layout
base.Title = "set of Images";
this._mainLayout = new StackLayout()
{
Orientation = StackOrientation.Vertical,
BackgroundColor = Color.Black,
Padding = new Thickness(0, 10, 0, 0)
};
this._btnPrevI = new Image()
{
Aspect = Aspect.AspectFill,
Source = ImageSource.FromResource(directory+"prevbtn.png")
};
_btnPrevI.GestureRecognizers.Add(prevI_Tap);
this._displayName = new Label()
{
Style = Device.Styles.SubtitleStyle,
HorizontalOptions = LayoutOptions.CenterAndExpand,
VerticalOptions = LayoutOptions.CenterAndExpand,
TextColor = Color.White,
};
this._btnNextI = new Image()
{
Aspect = Aspect.AspectFill,
Source = ImageSource.FromResource(directory + "nextbtn.png")
};
_btnNextI.GestureRecognizers.Add(nextI_Tap);
this._buttonStack.Children.Add(_btnPrevI);
this._buttonStack.Children.Add(_displayName);
this._buttonStack.Children.Add(_btnNextI);
this._mainLayout.Children.Add(_buttonStack);
FillImage(idx);
this._mainLayout.Children.Add(this._image);
this.Content = this._mainLayout;
}
private void FillImage(int i)
{
this._displayName.Text = "Image n# " + FillWithZeroes(i);
// [EDIT 1] cemented these lines ...
// this._image = null;
// mi = _images[i];
// this._image = mi;
// [EDIT 2] the new try
string f = directory + "imgs.img0" + FillWithZeroes(i) + ".png";
this._image = new Image() {
VerticalOptions = LayoutOptions.Center,
Soruce = ImageSource.FromResource(f)
};
// In this way the image show and don't change when click
// this Fking* code is a big S_OF_THE_B*
// The Xamarin and the C# is brothers of this FKing* code
}
private void onClick(string v)
{
string vw = v;
if (vw.Equals("pvi")) idx--;
if (vw.Equals("nti")) idx++;
if (idx <= 0) idx = 29;
if (idx >= 29) idx = 0;
FillImage(idx);
vw = "";
}
private string FillWithZeroes(int v)
{
string s = v.ToString();
string r = "";
if (s.Length == 1) { r = "0" + s; } else { r = s; }
return r;
}
// to fill a list of Images with files in a PCL folder
private List<Image> getImages()
{
string directory = "MyApp.Assets.";
List<Image> imgCards = new List<Image>();
int c = 0;
for (c = 0; c < 30;c++) {
string f = directory + "imgs.img0" + FillWithZeroes(c) + ".png";
Image img = new Image();
img.Source = ImageSource.FromResource(f);
imgCards.Add(img);
}
return imgCards;
}
// ...
}
but the image don't change, i.e. change, like I see in debug, but don't show in the Layout when I click in the buttons.
Maybe I'm doing it wrong.
Can someone here help me?
thanks in advance
What is the function of Message sender in xamarin.forms? In my app I have cart contain list view and a Grant Total label. Is it possible to update the label using message sender? I can get the total amount from my sqlite db I need to update it to the view.
This is my number picker index change event in view cell
numPicker.SelectedIndexChanged += (sender, args) =>
{
// var price = _cartQuery.GetSum();
sender = BindingContext;
// cm_items item = (cm_items)sender;
if(Int32.Parse(btn_NumBtn.Text)<=1)
{
lbl_Price.Text = ((numPicker.SelectedIndex + 1) * (Int32.Parse(lbl_Price.Text))).ToString();
btn_NumBtn.Text = (numPicker.SelectedIndex + 1).ToString();
}
else
{
int a = Int32.Parse(lbl_Price.Text);
int b = Int32.Parse(btn_NumBtn.Text);
int c = a / b;
lbl_Price.Text = ((numPicker.SelectedIndex + 1) * c).ToString();
btn_NumBtn.Text = (numPicker.SelectedIndex + 1).ToString();
}
_cartQuery.UpdatePicker((BindingContext as CartDB).Cart_Item_Id, numPicker.SelectedIndex + 1, Int32.Parse(lbl_Price.Text));
price = _cartQuery.GetSum();
// App.Instance.ViewModel.TotalAmount = price;
// _cartDB.total = App.Instance.ViewModel.TotalAmount;
Calculate_price();
numPicker.IsEnabled = false;
};
Calculate_price method
public double Calculate_price()
{
try
{
var price = 0;
price = _cartQuery.GetSum();
App.Instance.ViewModel.TotalAmount = price;
return price;
}
catch (Exception ex)
{
throw ex;
}
}
In my view i have a label named grant total, i need to update the total on e number picker change
Label lbl_amnt = new Label
{
// Text = viewModel.Price.ToString(),
// Text=CartCell.price.ToString(),
Text = price.ToString(),
FontSize = 18,
FontAttributes = FontAttributes.Bold,
TextColor = Color.FromRgb(102, 204, 102),
VerticalOptions = LayoutOptions.CenterAndExpand,
HorizontalOptions = LayoutOptions.EndAndExpand,
};
lbl_amnt.SetBinding(Label.TextProperty, "TotalAmount");
update to my post as per the comment from #Grish
In my view model i have this TotalAmount as a property
public double _TotalAmount;
public double TotalAmount
{
get { return _TotalAmount; }
set { _TotalAmount = value; OnPropertyChanged("TotalAmount");}
}
I think the better solution is i notify but the thing is view is not binding
Binding is definitely the answer in your case. I think the problem is that you bind string (label's text) to property of type double.
You should specify IValueConverter or stringFormat parameters in your call to SetBinding.
Check this link:
https://forums.xamarin.com/discussion/19146/binding-to-integers
I've made a simple performance test between EPPlus and Spreadsheet Gear to see if there is any significant difference that would justify buying Spreadsheet Gear.
I am no expert at either application so it's possible the tests aren't written the most efficient way.
The test does the following:
1. Opens an existing Excel-file with 1000 rows and 3 columns. Saves the three values into an entity that is saved into a List<>.
2. Open a new Excel-object
3. Create a header row (bold) with the title of each column.
4. Write back the 1000 entities.
5. Save the new Excelfile.
If I run this test once EPPlus comes out the winner (approx times are EPPlus = 280ms, SG = 500ms). If I run the test 10 times in a row instead (a for-loop opening, copying, saving 10 seperate times) Spreadsheet Gear is faster instead (approx times per file: EPPlus = 165ms, SG = 95ms). For 20 tests the approx times are EPPlus = 160ms / file and SG = 60ms / file.
It seems like (to a certain extent at least) Spreadsheet Gears gets faster and faster the more files I create.
Could anyone explain why EPPlus is the slower one when running consecutive tests? And can I make changes to the code to change this?
EPPlus test function:
var timer = new Stopwatch();
timer.Start();
var data = new List<Item>();
using (var excelIn = new ExcelPackage(new FileInfo(folder + fileIn)))
{
var sheet = excelIn.Workbook.Worksheets[1];
var row = 2;
while (sheet.Cells[row, 1].Value != null)
{
data.Add(new Item()
{
Id = int.Parse(sheet.Cells[row, 1].Text),
Title = sheet.Cells[row, 2].Text,
Value = int.Parse(sheet.Cells[row, 3].Text)
});
row++;
}
}
using (var excelOut = new ExcelPackage())
{
var sheet = excelOut.Workbook.Worksheets.Add("Out");
sheet.Cells.LoadFromCollection(data);
sheet.InsertRow(1, 1);
sheet.Cells[1, 1, 1, 3].Style.Font.Bold = true;
sheet.Cells[1, 1].Value = "Id";
sheet.Cells[1, 2].Value = "Title";
sheet.Cells[1, 3].Value = "Value";
excelOut.SaveAs(new FileInfo(folder + "EPPlus_" + Guid.NewGuid() + ".xlsx"));
}
timer.Stop();
return timer.ElapsedMilliseconds;
Spreadsheet Gear:
var timer = new Stopwatch();
timer.Start();
var data = new List<Item>();
var excelIn = Factory.GetWorkbook(folder + fileIn);
var sheetIn = excelIn.Worksheets[0];
var rowIn = 1;
while (sheetIn.Cells[rowIn, 0].Value != null)
{
data.Add(new Item()
{
Id = int.Parse(sheetIn.Cells[rowIn, 0].Text),
Title = sheetIn.Cells[rowIn, 1].Text,
Value = int.Parse(sheetIn.Cells[rowIn, 2].Text)
});
rowIn++;
}
excelIn.Close();
var excelOut = Factory.GetWorkbook();
var sheetOut = excelOut.Worksheets.Add();
sheetOut.Name = "Out";
var rowOut = 0;
sheetOut.Cells[rowOut, 0, rowOut, 2].Font.Bold = true;
sheetOut.Cells[rowOut, 0].Value = "Id";
sheetOut.Cells[rowOut, 1].Value = "Title";
sheetOut.Cells[rowOut++, 2].Value = "Value";
foreach (var item in data)
{
sheetOut.Cells[rowOut, 0].Value = item.Id;
sheetOut.Cells[rowOut, 1].Value = item.Title;
sheetOut.Cells[rowOut++, 2].Value = item.Value;
}
excelOut.SaveAs(folder + "SpreadsheetGear_" + Guid.NewGuid() + ".xlsx", FileFormat.OpenXMLWorkbook);
excelOut.Close();
timer.Stop();
return timer.ElapsedMilliseconds;
Main function
var runs = 1;
var testerG = new TestSpreadsheetGear();
var testerE = new TestEpPlus();
var msE = 0.0;
var msG = 0.0;
var i = 0;
for (i = 0; i < runs; ++i)
{
msG += new TestSpreadsheetGear().Run(folder, originalFile);
}
for(i = 0; i < runs; ++i)
{
msE += new TestEpPlus().Run(folder, originalFile);
}
Console.WriteLine("Spreadsheet time: " + msG + ". Per file: " + msG / runs);
Console.WriteLine("EP Plus time: " + msE + ". Per file: " + msE / runs);
Console.ReadKey();
I believe that the reason for the results you are seeing is the fact that on the first run the .NET CLR must JIT the code. Since SpreadsheetGear is a complete spreadsheet engine under the hood (as opposed to a read / write library) there is more code to JIT - thus the first run is taking longer for SpreadsheetGear than EPPlus (I am speculating here but have a great deal of experience in benchmarking .NET code over the last 10 years).
I do not have EPPlus installed but I did write a test which tries to do the same thing you are doing. with SpreadsheetGear 2012 Since I don't have your starting workbook I first build the workbook. Then, I used more optimal SpreadsheetGear APIs. The first time I run I get 141 milliseconds for SpreadsheetGear 2012. After the first run I get 9 or 10 milliseconds for each run on an overclocked Core i7-980x running Win7 x86 and a release build run without debugger.
I have pasted my code below (just paste it into a .NET 4.0 C# console application).
One more thought I have is that this is a very small test case. To really see the performance of SpreadsheetGear 2012 try this with 100,000 rows or even 1 million rows.
Disclaimer: I own SpreadsheetGear LLC
using System;
using System.Collections.Generic;
using System.Diagnostics;
using SpreadsheetGear;
namespace SGvsEPPlus
{
class Program
{
internal struct Item
{
internal Item(int id, string title, int value)
{
Id = id;
Title = title;
Value = value;
}
internal int Id;
internal string Title;
internal int Value;
}
static void Test(int rows)
{
string filename = #"C:\tmp\MyWorkbook.xlsx";
Console.Write("Test({0})...", rows);
var timer = new Stopwatch();
// Create workbook since we don't have poster's original workbook.
timer.Restart();
var workbook = Factory.GetWorkbook();
var values = (SpreadsheetGear.Advanced.Cells.IValues)workbook.Worksheets[0];
for (int row = 1; row <= rows; row++)
{
values.SetNumber(row, 0, row);
values.SetText(row, 1, "Title " + row);
values.SetNumber(row, 2, row * 10);
}
Console.Write("Create workbook={0:0}...", timer.Elapsed.TotalMilliseconds);
// Save workbook
timer.Restart();
workbook.SaveAs(filename, FileFormat.OpenXMLWorkbook);
Console.Write("Save workbook={0:0}...", timer.Elapsed.TotalMilliseconds);
// Track total time of original test.
var totalTimer = Stopwatch.StartNew();
// Open workbook
timer.Restart();
var excelIn = Factory.GetWorkbook(filename);
Console.Write("Open excelIn={0:0}...", timer.Elapsed.TotalMilliseconds);
// Copy workbook to list
timer.Restart();
var sheetIn = excelIn.Worksheets[0];
var valuesIn = (SpreadsheetGear.Advanced.Cells.IValues)sheetIn;
var rowIn = 1;
var data = new List<Item>(rows);
while (valuesIn[rowIn, 0] != null)
{
data.Add(new Item(
(int)valuesIn[rowIn, 0].Number,
valuesIn[rowIn, 1].Text,
(int)valuesIn[rowIn, 2].Number));
rowIn++;
}
excelIn.Close(); // Not necessary but left for consistency.
Console.Write("excelIn->data={0:0}...", timer.Elapsed.TotalMilliseconds);
timer.Restart();
var excelOut = Factory.GetWorkbook();
var sheetOut = excelOut.Worksheets[0];
var valuesOut = (SpreadsheetGear.Advanced.Cells.IValues)sheetOut;
sheetOut.Name = "Out";
var rowOut = 0;
sheetOut.Cells[rowOut, 0, rowOut, 2].Font.Bold = true;
sheetOut.Cells[rowOut, 0].Value = "Id";
sheetOut.Cells[rowOut, 1].Value = "Title";
sheetOut.Cells[rowOut++, 2].Value = "Value";
foreach (var item in data)
{
valuesOut.SetNumber(rowOut, 0, item.Id);
valuesOut.SetText(rowOut, 1, item.Title);
valuesOut.SetNumber(rowOut, 2, item.Value);
rowOut++;
}
Console.Write("data->excelOut={0:0}...", timer.Elapsed.TotalMilliseconds);
timer.Restart();
excelOut.SaveAs(#"C:\tmp\SpreadsheetGear_" + Guid.NewGuid() + ".xlsx", FileFormat.OpenXMLWorkbook);
excelOut.Close(); // Again - not necessary.
Console.WriteLine("Save excelOut={0:0}...", timer.Elapsed.TotalMilliseconds);
Console.WriteLine(" Total={0:0}", totalTimer.Elapsed.TotalMilliseconds);
}
static void Main(string[] args)
{
// Do it three times with 1000 rows. Note that the first
// time takes longer because code must be JITted.
Test(1000);
Test(1000);
Test(1000);
}
}
}
I have 3 questions:
wheter I am doing my task in a good way
why when I scroll dataGridView, painted rectangles dissapear..
why painting is so slow...
Here is the code in which I want to draw a colorful rectangle with text on groups of cells in each column, that have the same values, empty values shouldn't have rectangles
void DataGridView1CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
{
foreach (DataGridViewColumn column in this.dataGridView1.Columns){
string tempCellValue = string.Empty;
int tempRectX = -1;
int tempRectY = -1;
int tempRectYEnd = -1;
int tempRectWidth = -1;
int tempRectHeight = -1;
foreach (DataGridViewRow row in this.dataGridView1.Rows){
Rectangle rect = this.dataGridView1.GetCellDisplayRectangle(
column.Index, row.Index,true);
DataGridViewCell cell = dataGridView1.Rows[row.Index].Cells[column.Index];
if ( cell.Value!=null){
if (tempRectX==-1){
tempRectX = rect.Location.X;
tempRectY = rect.Location.Y;
tempCellValue = cell.Value.ToString();
}else
if (cell.Value.ToString()!=tempCellValue){
tempRectYEnd = rect.Location.Y;
Rectangle newRect = new Rectangle(tempRectX,
tempRectY , 5 ,
tempRectYEnd );
using (
Brush gridBrush = new SolidBrush(Color.Coral),
backColorBrush = new SolidBrush(Color.Coral))
{
using (Pen gridLinePen = new Pen(gridBrush))
{
e.Graphics.FillRectangle(backColorBrush,newRect);
} }
tempRectX=-1;
tempCellValue = string.Empty;
}
}else if (tempRectX!=-1){
tempRectYEnd = rect.Location.Y;
Rectangle newRect = new Rectangle(tempRectX,
tempRectY , 50 ,
tempRectYEnd );
using (
Brush gridBrush = new SolidBrush(Color.Coral),
backColorBrush = new SolidBrush(Color.Coral))
{
using (Pen gridLinePen = new Pen(gridBrush))
{
e.Graphics.FillRectangle(backColorBrush,newRect);
} }
tempRectX=-1;
tempCellValue = string.Empty;
}
}}
The DataGridView1CellPainting event is intended to Paint or change Paint behaviour for one cell.
DGV raises this event for each visible Cell.
When Paint other cells, your code slow down.
http://msdn.microsoft.com/en-us/library/system.windows.forms.datagridviewcellpaintingeventargs.aspx