📄 customcounterinstances.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>
<!--------------------------------------------------------------------------->

<html>

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

  String Category = "Wrox";
  String Counter  = "Web Services";
  

  void page_load(Object Sender, EventArgs e)
  {
    if (!Page.IsPostBack)
    {
      if (PerformanceCounterCategory.Exists(Category))
        AlreadyExists.Visible = true;
    }
  }

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

      ccdc.Add(new CounterCreationData(Counter, "Web Service Requests", PerformanceCounterType.NumberOfItems32));

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

    ShowCounters();
  }


  void ProcessCounter_Click(Object Sender, CommandEventArgs e)
  {
    if (PerformanceCounterCategory.Exists(Category))
    {
      // CommandArgument contains the name of the counter
      PerformanceCounter pc = new PerformanceCounter(Category, Counter, e.CommandArgument.ToString(), false);
      pc.Increment();

      pc.InstanceName = "_Total";
      pc.Increment();

      ShowCounters();
    }
  }
  
  
  void DeleteCounters_Click(Object Sender, EventArgs e)
  {
    // delete all counters and the catageory
    if (PerformanceCounterCategory.Exists(Category))
    {
      PerformanceCounterCategory.Delete(Category);
      Page.Controls.Remove(CounterValues);
    }
  }


  // create a table showing the counter values
  void ShowCounters()
  {
    if (PerformanceCounterCategory.Exists(Category))
    {
      PerformanceCounterCategory cat = new PerformanceCounterCategory(Category);
      String[] instNames;
      
      // get the instance names
      instNames = cat.GetInstanceNames();
      
      // if more than one isntance we need to loop through the instances
      if (instNames.Length == 0)
        ShowCounterValues(cat.GetCounters());
      else
        for (int i = 0; i < instNames.Length - 1; i++)
          ShowCounterValues(cat.GetCounters(instNames[i]));
    }  
  }
  
  
  // display the data for a collection of counters
  void ShowCounterValues(PerformanceCounter[] pca)
  {
    String    s;
    TableRow  tr;
    TableCell tcc;
    TableCell tcv;
    TableCell tct;
    HtmlImage img;

    // now loop through the counters
    foreach (PerformanceCounter pc in pca)
    {
      // cell for text
      tcc = new TableCell();
      tcc.Text = pc.CounterHelp + ": " + pc.InstanceName;
      tcc.Width = Unit.Percentage(30);

      // 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">Instance 1</td>
      <td align="center">Instance 2</td>
      <td align="center">Instance 3</td>
    </tr>
    <tr>
      <td>
        <asp:Button CommandArgument="Instance1" Text="Increment"
             onCommand="ProcessCounter_Click" runat="server"/>
      </td>
      <td>
        <asp:Button CommandArgument="Instance2" Text="Increment"
             onCommand="ProcessCounter_Click" runat="server"/>
      </td>
      <td>
        <asp:Button CommandArgument="Instance3" Text="Increment"
             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>
  
  <asp:Label id="AlreadyExists"
       Text="The category 'Wrox' already exists. You should delete it before continuing."
       visible = "false" runat="server"/>
</form>

<!--------------------------------------------------------------------------->
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