Set a control event from string variable in C#

Question

2.00/5 (1 vote)

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Hi all,
I have a textbox control which been created dynamically!
I want to make a function to set textbox's (or any control) event and its delegate from a string variables.

C#

void SetEvent(ref Control control, string EventType, string EventDelegate)
{
     //Set control.event += delegate;   event = EventType and delegate = EventDelegate
}

Function call:

C#

SetEvent("TextChanged", "txtBox_TextChanged"); //The function will set the event dynamically according to the parameters (txtBox.TextChanged += new EventHandler(txtBox_TextChanged);)
OR
SetEvent("DataBinding", "txtBox_DataBinding"); //The function will set the event dynamically according to the parameters (txtBox.DataBinding += new EventHandler(txtBox_DataBinding);)

How can I achieve this procedure??????

Posted 18-Sep-13 21:32pm

Rasool Ahmed

Updated 18-Sep-13 22:31pm

v2

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2 solutions

Solution 1

Set onchange event on clientside for your TextBox when you create your control dynamically.

You can do that as the follows:

C#

yourTextBox.Attributes.Add("onchange", "alert(this.value);");

Maybe this can help you:
Parsing C# code (as string) and inserting additional methods[^]

Execute a user-provided string containing c# code[^]

Posted 18-Sep-13 22:25pm

norbitrial

Updated 18-Sep-13 22:36pm

v3

Comments

Rasool Ahmed 19-Sep-13 4:27am

That's not the solution I want.
I will update my question to understand it.

norbitrial 19-Sep-13 4:34am

I have updated my solution.

Rasool Ahmed 19-Sep-13 7:05am

norbitrial, these links tell that string containing code executed at runtime independent (outside the original code).
My code string must executed withing the original code.

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Rasool Ahmed · Accepted Answer · 2013-09-20T00:54:00

void SetEvent(object control, string eventTypes, string EventDelegate)
{
EventInfo ei = control.GetType().GetEvent(eventTypes);

MethodInfo mi = this.GetType().GetMethod(EventDelegate, BindingFlags.Public | BindingFlags.Instance | BindingFlags.NonPublic);

Delegate del = Delegate.CreateDelegate(ei.EventHandlerType, this, mi);

ei.AddEventHandler(control, del);
}