📄 readcounters.aspx

📁 asp.net技术内幕的书配源码

💻 ASPX

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<%@ Page Language="C#" %>
<%@ Import Namespace="System.Diagnostics" %>

<script language="C#" runat=server>

void Page_Load(Object sender , EventArgs e) 
{
	if (! IsPostBack ) {
		PerformanceCounterCategory objCategory;

		objCategory = new PerformanceCounterCategory( "ASP.NET Applications" );
		lstInstances.DataSource = objCategory.GetInstanceNames();
		DataBind();
	}
}

void SelectInstance( object s, EventArgs e ) {
	PerformanceCounterCategory objCategory;

	objCategory = new PerformanceCounterCategory( "ASP.NET Applications" );
	lstCounters.Visible = true;
	lstCounters.DataSource = objCategory.GetCounters( lstInstances.SelectedItem.Text );
	lstCounters.DataTextField = "CounterName";
	DataBind();
}

void SelectCounter( object s, EventArgs e ) {
	PerformanceCounter objCounter;

	objCounter = new PerformanceCounter( "ASP.NET Applications", lstCounters.SelectedItem.Text, lstInstances.SelectedItem.Text );
	lblValue.Text = objCounter.NextValue().ToString();
}
</Script>

<html>
<head><title>ReadCounters.aspx</title></head>
<body>

<h2>ASP.NET Application Performance Counters</h2>


<form Runat="Server">

<b>Instances</b>
<br>
<asp:ListBox
  ID="lstInstances"
  AutoPostback="True"
  OnSelectedIndexChanged="SelectInstance"
  Runat="Server" />
<p>
<b>Counters</b>
<br>
<asp:ListBox
  ID="lstCounters"
  Visible="False"
  AutoPostback="True"
  OnSelectedIndexChanged="SelectCounter"
  Runat="Server" />
<p>
<b>Counter Value:</b>
<asp:Label
  ID="lblValue"
  Runat="Server" />

</form>

</body>
</html>

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