We work with a RadGridView with 145000 rows and 4 columns. We use copy-paste to move data around from other apps and the application with build with Telerik.

When we copy a flat file (with tabs delimited fields) and we paste it to the RadGridView, the whole process is painfully slow. The function to retrieve the data from the clipboard takes minutes (maybe hours, I cancelled it). It tracked the cause down to the StringTokenizer class. The tokenizer splits the string up into separate fields. But after extracting a field it creates a new copy of that string (containing about 10MB of data) minus the field. I patched it (with HarmonyX) and now it takes only one second:

static class StringTokenizerPerformancePatch
{
	static private readonly InstanceFieldAccessor<StringTokenizer, LinkedList<string>> _tokens = new InstanceFieldAccessor< StringTokenizer, LinkedList<string>>("tokens");
	static private readonly InstanceFieldAccessor<StringTokenizer, string> _sourceString = new InstanceFieldAccessor<StringTokenizer, string>("sourceString");
	static private readonly InstanceFieldAccessor< StringTokenizer, string> _delimiter = new InstanceFieldAccessor<StringTokenizer, string>("delimiter");
	static private readonly InstanceFieldAccessor< StringTokenizer, IEnumerator<string>> _enumerator = new InstanceFieldAccessor<StringTokenizer, IEnumerator<string>>("enumerator");

	[HarmonyPatch(typeof(StringTokenizer), "Tokenize")]
	staticclassPatch_StringTokenizer_Tokenize
	{
		static bool Prefix(StringTokenizer __instance)
		{
			var tokens = _tokens.GetValue(__instance);
			var sourceString = _sourceString.GetValue(__instance);
			var delimiter = _delimiter.GetValue(__instance);
			Tokenize(tokens, sourceString, delimiter);
			_enumerator.SetValue(__instance, tokens.GetEnumerator());
			returnfalse;
		}

		static private void Tokenize(LinkedList<string> tokens, string text, string delimiter)
		{
			tokens.Clear();
			
			if (string.IsNullOrEmpty(text))
				return;

			int index = 0;
			while(true)
			{
				var index2 = text.IndexOf(delimiter, index, StringComparison.Ordinal);
				if (index2 < 0)
				{
					tokens.AddLast(text.Substring(index));
					break;
				}

				string token = text.Substring(index, index2 - index);
				tokens.AddLast(token);
				index = index2 + delimiter.Length;
			}
		}
	}
}

• If delimiters are one character, why not use String.Split?
• Why use a LinkedList?

The Cut operations of the RadVirtualGrid does not work.

When the SelectionMode is set to FullRowSelect, MultiSelect = true, and multiple rows are selected, the loop goes something like this:

// Pseudo code:
for(int rowIndex = firstRow; rowIndex <= lastRow; rowIndex++)
{
    AddRowToClipboardData(rowIndex)
    UserDeletedRow(rowIndex);
}

1. Lets say 10 rows are selected, only the even rows get copied. First row 0 is copied and deleted. When row 0 is deleted, all rows move a position down. So when copying row 1, it is actually row 2 that is copyied.
2. When cutting all rows, in my case an exception is thrown, because a rowIndex larger than the number of rows is referred to.
3. When cutting to multiple clipboard formats, the second format will not contain the original selected data, because it has already been deleted.

My suggestion:

1. First copy all the data and formats to the clipboard.
2. Then delete the selected rows.

RadVirtualGrid is created to support a million records or more. Still it contains some "heavy" operations like CopySelection/CutSelection/Paste which can take a long time.

I would like to intercept these methods so I can show a "Please wait"-window during the operation. Furthermore I have the need to set a flag to true when such a operation is executing. 

To be accessible and compliant with our organizations standards, the search bar that can be enabled in the gridview should be accessible by pressing TAB and shift TAB. Right now the only way to select the search by keyboard is pressing Control F, but the up/down arrows and the search settings cog wheel cannot be accessed via the keyboard.

As of right now, the user cannot also select the column headers using the keyboard, which in turn means you cannot sort by a column with a keyboard.

Add a RadTextBox on the form and open its smart tag:

Open the editor for the font and select the entire text:

Then, press Del:

When you try to close the editor, an error occurs:

However, the Font is already serialized as null:

As a result, the designer can't be opened any more:

Hi Team,

The Travel Assistant demos are broken... it just hangs. This is also true for the Xamarin Demos, WPF demos and WinForms demos.

Here are some screenshots:

UI for Winforms demos

Telerik UI for Xamarin demos

Pasting a Network path in the breadcrumb navigates the user to the respective location. However, the UNC path is displayed as expected. Please refer to the attached gif files.

Using Telerik button and dropdown beside and anchored to a standard label or textbox then, when run app in a Win 11 in Korean, the presentation is not correct.

Expected result:

Observed result:

In the image below you can notice lines that disappear, identical lines but rendered more or less thick.

Hi,

Please, add a property  or method to the RadWebCam control to set video bit rate or quality. Currently is fixed a 4 mbits and it results in very poor image quality at high resolutions.

Please find attached images to see the difference  between snapshot and video recording. With fast moving pictures is even worse.

Thanks.

Hi

It would be cool if the SyntaxEditor automatically changed the default palette if the selected scheme was dark.

Regards

Erwin

Windows Forms on .net 6.0 / 7.0 / 8.0 diverges more and more from .net Framework 4.x.

Please release a version of the Demo Application that is based on the current Microsoft Release.