Solved

Convert a string to a method call

Posted on 2009-04-13
2
338 Views
Last Modified: 2013-12-17
I have a form application with a "drop down list" and  "Select button".
There are 3 functions
void foo1()
{
 ...
}

void foo2()
{
...
}
void foo3()
{
...
}

Is it possible to:
1) Convert method names to string so that these strings can be added to "drop down list" as "foo1", "foo2", "foo3"
2) Once a value is selected in the drop down, is it possible to change the selected string to method call:
    i.e. "foo1" as foo1()
          "foo2" as foo2()
         "foo3" as foo3()

My basic understanding of C# says, it is not possible. But I want to find from experts, if there is a way to do this.

Thanks,
0
Comment
Question by:ukalyan
2 Comments
 
LVL 6

Accepted Solution

by:
Cebik earned 250 total points
ID: 24133454
0
 
LVL 23

Assisted Solution

by:Tiggerito
Tiggerito earned 250 total points
ID: 24136387
Here's a more structured way to do it using delegates.

Delegates are a way to reference methods and call them later
/// <summary>
/// Define the signature of the methods that can be placed in the combo. e.g.
/// void fooX()
/// </summary>
public delegate void DropDownMethod();
 
/// <summary>
/// A class to be used as items in the combo box
/// </summary>
public class DropDownMethodItem
{
	public DropDownMethodItem(string name, DropDownMethod method)
	{
		Name = name;
		Method = method;
	}
 
	/// <summary>
	/// Display text
	/// </summary>
	public string Name;
 
	/// <summary>
	/// A deligate pointing to the method this item will call
	/// </summary>
	public DropDownMethod Method;
 
	/// <summary>
	/// This controls the display text
	/// </summary>
	/// <returns></returns>
	public override string ToString()
	{
		return Name;
	}
}
 
#region methods to call 
public void foo1()
{
	MessageBox.Show("foo1 called");
}
 
public void foo2()
{
	MessageBox.Show("foo2 called");
}
 
public void foo3()
{
	MessageBox.Show("foo3 called");
}
#endregion
 
/// <summary>
/// Polulates the combo box with each method. In my case I click a button to populate
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void buttonPopulate_Click(object sender, EventArgs e)
{
	comboBox1.Items.Add(new DropDownMethodItem("foo1", new DropDownMethod(foo1)));
	comboBox1.Items.Add(new DropDownMethodItem("foo2", new DropDownMethod(foo2)));
	comboBox1.Items.Add(new DropDownMethodItem("foo3", new DropDownMethod(foo3)));
}
 
/// <summary>
/// Call the selected method when its item is selected
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
	((DropDownMethodItem)comboBox1.SelectedItem).Method();
}

Open in new window

0

Featured Post

DevOps Toolchain Recommendations

Read this Gartner Research Note and discover how your IT organization can automate and optimize DevOps processes using a toolchain architecture.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

A basic question.. “What is the Garbage Collector?” The usual answer given back: “Garbage collector is a background thread run by the CLR for freeing up the memory space used by the objects which are no longer used by the program.” I wondered …
Today I had a very interesting conundrum that had to get solved quickly. Needless to say, it wasn't resolved quickly because when we needed it we were very rushed, but as soon as the conference call was over and I took a step back I saw the correct …
This Micro Tutorial demonstrates using Microsoft Excel pivot tables, how to reverse engineer competitors' marketing strategies through backlinks.
Windows 10 is mostly good. However the one thing that annoys me is how many clicks you have to do to dial a VPN connection. You have to go to settings from the start menu, (2 clicks), Network and Internet (1 click), Click VPN (another click) then fi…

773 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question