📄 customcounters.aspx

📁 东软内部材料（四）asp等相关的教学案例　
💻 ASPX
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<%@ Page debug="true" Trace="false" %>

<%@ Import Namespace="System.Diagnostics" %>

<html>
<head>
<title>Custom Performance Counters</title>
</head>
<body>
<!--------------------------------------------------------------------------->

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

  void Page_Load(Object Sender, EventArgs E)
  {
    if (Page.IsPostBack)
    {
      // if the category already exist, increment the postback counter
      if (PerformanceCounterCategory.Exists("Wrox"))
        IncrementCounter("Wrox", "PostBack");
    }
  }


  void IncrementCounter(String Category, String Counter)
  {
    if (PerformanceCounterCategory.Exists("Wrox"))
    {
      PerformanceCounter pc = new PerformanceCounter(Category, Counter, false);
      pc.Increment();
    }
  }
  
  
  void DecrementCounter(String Category, String Counter)
  {
    if (PerformanceCounterCategory.Exists("Wrox"))
    {
      PerformanceCounter pc = new PerformanceCounter(Category, Counter, false);
      
      if (pc.RawValue > 0)
        pc.Decrement();
    }
  }


  void CreateCounters_Click(Object Sender, EventArgs E)
  {
    // only create the counters if they don't already exist
    if (!PerformanceCounterCategory.Exists("Wrox"))
    {
      // set up the counter details
      CounterCreationDataCollection ccdc = new CounterCreationDataCollection();

      ccdc.Add(new CounterCreationData("Counter1", "Counter 1",         PerformanceCounterType.NumberOfItems32));
      ccdc.Add(new CounterCreationData("Counter2", "Counter 2",         PerformanceCounterType.NumberOfItems32));
      ccdc.Add(new CounterCreationData("Counter3", "Counter 3",         PerformanceCounterType.NumberOfItems32));
      ccdc.Add(new CounterCreationData("PostBack", "Postback occurred", PerformanceCounterType.NumberOfItems32));

      PerformanceCounterCategory.Create("Wrox", "Wrox Press Professional ASP.NET Samples", ccdc);
    }

    ShowCounterValues();
  }


  void ProcessCounter_Click(Object Sender, CommandEventArgs e)
  {
    if (PerformanceCounterCategory.Exists("Wrox"))
    {
      // The CommandName contains what we want to do (Increment/Decrement), and
      // the CommandArgument contains the name of the counter
      if (e.CommandName == "Increment")
        IncrementCounter("Wrox", e.CommandArgument.ToString());
      else
        DecrementCounter("Wrox", e.CommandArgument.ToString());

      ShowCounterValues();
    }
  }
  
  
  void DeleteCounters_Click(Object Sender, EventArgs E)
  {
    // delete all counters and the catageory
    if (PerformanceCounterCategory.Exists("Wrox"))
    {
      PerformanceCounterCategory.Delete("Wrox");
      Page.Controls.Remove(CounterValues);
    }
  }


  // create a table showing the counter values
  void ShowCounterValues()
  {
    if (PerformanceCounterCategory.Exists("Wrox"))
    {
      PerformanceCounterCategory cat = new PerformanceCounterCategory("Wrox");
			String    s;
			TableRow  tr;
			TableCell tcc;
			TableCell tcv;
			TableCell tct;
			HtmlImage img;

      // Construct a table row for each counter
      foreach (PerformanceCounter pc in cat.GetCounters())
			{
        // cell for text
        tcc = new TableCell();
        tcc.Text = pc.CounterHelp;
        tcc.Width = Unit.Percentage(20);
        
        // text value
        tct = new TableCell();
        tct.Text = pc.RawValue.ToString();
        tct.Width = Unit.Percentage(5);
        
        // bar graph and cell containing it
        img = new HtmlImage();
        img.Src = "RedPixel.gif";
        img.Width = (int)pc.RawValue;
        img.Height = 20;
        tcv = new TableCell();
        tcv.Controls.Add(img);
        
        // add cells to row, and rows to table
        tr = new TableRow();
        tr.Cells.Add(tcc);
        tr.Cells.Add(tct);
        tr.Cells.Add(tcv);
        CounterValues.Rows.Add(tr);
      }
    }
  }

</script>

<form runat="server">

  <asp:Button Text="Create Counters" onClick="CreateCounters_Click" runat="server"/>
  &nbsp;
  <asp:Button Text="Delete Counters" onClick="DeleteCounters_Click" runat="server"/>
  <p/>
  
  <table cellspacing="10">
    <tr>
      <td align="center">Counter 1</td>
      <td align="center">Counter 2</td>
      <td align="center">Counter 3</td>
    </tr>
    <tr>
      <td>
        <asp:Button CommandName="Increment" CommandArgument="Counter1" Text="Increment"
             onCommand="ProcessCounter_Click" runat="server"/>
        <asp:Button CommandName="Decrement" CommandArgument="Counter1" Text="Decrement"
             onCommand="ProcessCounter_Click" runat="server"/>
      </td>
      <td>
        <asp:Button CommandName="Increment" CommandArgument="Counter2" Text="Increment"
             onCommand="ProcessCounter_Click" runat="server"/>
        <asp:Button CommandName="Decrement" CommandArgument="Counter2" Text="Decrement"
             onCommand="ProcessCounter_Click" runat="server"/>
      </td>
      <td>
        <asp:Button CommandName="Increment" CommandArgument="Counter3" Text="Increment"
             onCommand="ProcessCounter_Click" runat="server"/>
        <asp:Button CommandName="Decrement" CommandArgument="Counter4" Text="Decrement"
             onCommand="ProcessCounter_Click" runat="server"/>
      </td>
    </tr>
  </table>
        
  <p/>

  <asp:Table id="CounterValues" width="75%" runat="server">
    <asp:TableRow>
      <asp:TableHeaderCell HorizontalAlign="Left">Counter</asp:TableHeaderCell>
      <asp:TableHeaderCell HorizontalAlign="Left">Value</asp:TableHeaderCell>
      <asp:TableHeaderCell HorizontalAlign="Left">Value</asp:TableHeaderCell>
    </asp:TableRow>
  </asp:table>
  
</form>

<!--------------------------------------------------------------------------->
</body>
</html>
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