Questions on UI for WinForms Forum

1 answer

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Editing/filtering on RadGrid Crash the application, with System.Argument null exception

I am trying to use the RadDataGrid view, with the autoGenerateColumn Property set to false, I added three columns as follows.

radGridView1.Columns.Add(new
Telerik.WinControls.UI.GridViewDataColumn("ProductId"));
radGridView1.Columns.Add(new Telerik.WinControls.UI.GridViewDataColumn("ProductName"));
radGridView1.Columns.Add(new Telerik.WinControls.UI.GridViewDataColumn("UnitPrice"));

and then i bounded the data source to list<Products>

When I run the application and try to edit any of the fields or if I try to type in the filter box the application crashes with the following exception. While investigating the problem I found out that the default editor for the columns is never instantiated and is set to null

radGridView1.Columns["ProductId"].GetDefaultEditor()==null

Sample Code
-----------

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

private void Form1_Load(object sender, EventArgs e)

{

radGridView1.MasterGridViewTemplate.AutoGenerateColumns = false; //disable auto generate columns

radGridView1.EnableFiltering = true; //enable filter

radGridView1.MasterGridViewTemplate.AutoSizeColumnsMode = Telerik.WinControls.UI.GridViewAutoSizeColumnsMode.Fill;

//Add columns

radGridView1.Columns.Add(new Telerik.WinControls.UI.GridViewDataColumn("ProductId"));

radGridView1.Columns.Add(new Telerik.WinControls.UI.GridViewDataColumn("ProductName"));

radGridView1.Columns.Add(new Telerik.WinControls.UI.GridViewDataColumn("UnitPrice"));

//Bind data

radGridView1.DataSource = GetProductList();

}

public List<Product> GetProductList()

{

var products = new List<Product>();

products.Add(new Product("PRD-001", "Betty Crocker® Angel Food Cake Mix", 8.65));

products.Add(new Product("PRD-002", "Betty Crocker Complete Desserts®", 8));

products.Add(new Product("PRD-003", "Betty Crocker® Cookie Mix", 1.25));

products.Add(new Product("PRD-004", "Betty Crocker® Frosting", 4.00));

products.Add(new Product("PRD-005", "Betty Crocker® Sunkist® Lemon Bars", 10.00));

products.Add(new Product("PRD-006", "Betty Crocker® Supreme Brownie Mix", 2.00));

products.Add(new Product("PRD-007", "Betty Crocker® Variety Dessert Mixes", 3.55));

products.Add(new Product("PRD-008", "Betty Crocker® Warm Delights® Desserts", 4.49));

return products;

}

public class Product

{

public Product()

{

}

public Product(string id, string name, double price)

{

this.ProductId = id;

this.ProductName = name;

this.UnitPrice = price;

}

public string ProductId { get; set; }

public string ProductName { get; set; }

public double UnitPrice { get; set; }

}

EXception Detail
-----------------------
System.ArgumentNullException was unhandled
Message="Value cannot be null.\r\nParameter name: key"
Source="mscorlib"
ParamName="key"
StackTrace:
       at System.ThrowHelper.ThrowArgumentNullException(ExceptionArgument argument)
       at System.Collections.Generic.Dictionary`2.FindEntry(TKey key)
       at System.Collections.Generic.Dictionary`2.TryGetValue(TKey key, TValue& value)
       at Telerik.WinControls.UI.GridViewEditManager.GetDefaultEditor(IEditorProvider provider)
       at Telerik.WinControls.UI.BaseGridBehavior.InitializeEditor(RadGridView grid, GridViewColumn column)
       at Telerik.WinControls.UI.GridDataCellElement.item_Click(Object sender, EventArgs e)
       at Telerik.WinControls.RadItem.OnClick(EventArgs e)
       at Telerik.WinControls.UI.RadButtonItem.OnClick(EventArgs e)
       at Telerik.WinControls.UI.RadMenuItemBase.OnClick(EventArgs e)
       at Telerik.WinControls.UI.RadMenuItem.OnClick(EventArgs e)
       at Telerik.WinControls.RadItem.DoClick(EventArgs e)
       at Telerik.WinControls.RadItem.RaiseBubbleEvent(RadElement sender, RoutedEventArgs args)
       at Telerik.WinControls.RadElement.RaiseRoutedEvent(RadElement sender, RoutedEventArgs args)
       at Telerik.WinControls.RadItem.RaiseBubbleEvent(RadElement sender, RoutedEventArgs args)
       at Telerik.WinControls.RadElement.RaiseRoutedEvent(RadElement sender, RoutedEventArgs args)
       at Telerik.WinControls.RadElement.DoMouseUp(MouseEventArgs e)
       at Telerik.WinControls.RadElement.CallDoMouseUp(MouseEventArgs e)
       at Telerik.WinControls.ComponentInputBehavior.OnMouseUp(MouseEventArgs e)
       at Telerik.WinControls.RadControl.OnMouseUp(MouseEventArgs e)
       at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
       at System.Windows.Forms.Control.WndProc(Message& m)
       at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
       at Telerik.WinControls.RadControl.WndProc(Message& m)
       at Telerik.WinControls.UI.RadPopupControl.WndProc(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
       at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
       at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
       at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.Run(Form mainForm)
       at RadGridViewTest.Program.Main() in C:\Documents and Settings\ddebela\My Documents\Visual Studio 2008\Projects\RadGridViewTest\RadGridViewTest\Program.cs:line 17
       at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
InnerException:

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