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LinkLabel.LinkCollection.IndexOf Method

Returns the index of the specified link within the collection.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

public int IndexOf(
	LinkLabel..::..Link link
)

Parameters

link
Type: System.Windows.Forms.LinkLabel.Link
A LinkLabel.Link representing the link to search for in the collection.

Return Value

Type: System.Int32
The zero-based index where the link is located within the collection; otherwise, negative one (-1).

The IndexOf method enables you to determine where a link is located within the collection. To determine if a link is located within the collection before calling this method, use the Contains method.

The following code example demonstrates setting the LinkBehavior property using the LinkBehavior enumeration. It also demonstrates setting the ActiveLinkColor, LinkColor, Text and LinkVisited properties and adding and accessing links in a LinkLabel.LinkCollection. To run this example, paste it in a blank form and call InitializeLinkLabel from the form's constructor or Load event handler.



	// Declare the LinkLabel object.
	internal System.Windows.Forms.LinkLabel LinkLabel1;

	// Declare keywords array to identify links
	string[] keywords;

	private void InitializeLinkLabel()
	{
		this.LinkLabel1 = new System.Windows.Forms.LinkLabel();
                this.LinkLabel1.Links.Clear();

		// Set the location, name and size.
		this.LinkLabel1.Location = new System.Drawing.Point(10, 20);
		this.LinkLabel1.Name = "CompanyLinks";
		this.LinkLabel1.Size = new System.Drawing.Size(104, 150);

		// Set the LinkBehavior property to show underline when mouse
		// hovers over the links.
		this.LinkLabel1.LinkBehavior = System.Windows.Forms.LinkBehavior.HoverUnderline;
		string textString = "For more information see our" +
			" company website or the research page at Contoso Ltd. ";

		// Set the text property.
		this.LinkLabel1.Text = textString;

		// Set the color of the links to black, unless the mouse
		// is hovering over a link.
		this.LinkLabel1.LinkColor = System.Drawing.Color.Black;
		this.LinkLabel1.ActiveLinkColor = System.Drawing.Color.Blue;

		// Associate the event-handling method with the LinkClicked
		// event.
		this.LinkLabel1.LinkClicked += 
			new LinkLabelLinkClickedEventHandler(LinkLabel1_LinkClicked);

		// Add links to the LinkCollection using starting index and
		// length of keywords.
		keywords = new string[]{"company", "research"};
		foreach ( string keyword in keywords )
		{
			this.LinkLabel1.Links.Add(textString.IndexOf(keyword), keyword.Length);
		}

		// Add the label to the form.
		this.Controls.Add(this.LinkLabel1);
	}

	private void LinkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
	{

		string url = "";

		// Determine which link was clicked and set the appropriate url.
		switch(LinkLabel1.Links.IndexOf(e.Link))
		{
			case 0:
				url = "www.microsoft.com";

				break;
			case 1:
				url = "www.contoso.com/research";
				break;
		}

		// Set the visited property to True. This will change
		// the color of the link.
		e.Link.Visited = true;

		// Open Internet Explorer to the correct url.
		System.Diagnostics.Process.Start("IExplore.exe", url);
	}


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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