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ExpressionBuilderCollection Class

Represents a collection of ExpressionBuilder objects. This class cannot be inherited.

Namespace: System.Web.Configuration
Assembly: System.Web (in system.web.dll)
public sealed class ExpressionBuilderCollection : ConfigurationElementCollection
public final class ExpressionBuilderCollection extends ConfigurationElementCollection
public final class ExpressionBuilderCollection extends ConfigurationElementCollection
Not applicable.

The ExpressionBuilderCollection class does not refer to any actual element in the underlying configuration file. It is a construct that allows easy access to the compilation information it contains.

This section provides two code examples. The first demonstrates how to declaratively specify values for several properties of the ExpressionBuilderCollection class. The second demonstrates how to use members of the ExpressionBuilderCollection class.

The following configuration file example shows how to declaratively specify values for several properties of the ExpressionBuilderCollection class.

<system.web>
  <compilation> 
    <expressionBuilders>
      <add 
        expressionPrefix="Resources" 
        type="System.Web.Compilation.ResourceExpressionBuilder"/>
      <add 
        expressionPrefix="ConnectionStrings" 
        type="System.Web.Compilation.
        ConnectionStringsExpressionBuilder"/>
      <add expressionPrefix="AppSettings" 
        type="System.Web.Compilation.AppSettingsExpressionBuilder" />
    </expressionBuilders>
  </compilation>
</system.web>

The following code example demonstrates how to use members of the ExpressionBuilderCollection class.

#region Using directives

using System;
using System.Configuration;
using System.Web.Configuration;

#endregion

namespace Samples.Aspnet.SystemWebConfiguration
{
  class UsingExpressionBuildCollection
  {
    static void Main(string[] args)
    {
      try
      {
        // Set the path of the config file.
        string configPath = "";

        // Get the Web application configuration object.
        Configuration config =
          WebConfigurationManager.OpenWebConfiguration(configPath);

        // Get the section related object.
        CompilationSection configSection =
          (CompilationSection)config.GetSection("system.web/compilation");

        // Display title and info.
        Console.WriteLine("ASP.NET Configuration Info");
        Console.WriteLine();

        // Display Config details.
        Console.WriteLine("File Path: {0}",
          config.FilePath);
        Console.WriteLine("Section Path: {0}",
          configSection.SectionInformation.Name);

        // Create a new ExpressionBuilder reference.
        ExpressionBuilder myExpressionBuilder =
          new ExpressionBuilder("myCustomExpression", "MyCustomExpressionBuilder");
        // Add an ExpressionBuilder to the configuration.
        configSection.ExpressionBuilders.Add(myExpressionBuilder);

        // Add an ExpressionBuilder to the configuration.
        ExpressionBuilder myExpressionBuilder2 =
          new ExpressionBuilder("myCustomExpression2", "MyCustomExpressionBuilder2");
        configSection.ExpressionBuilders.Add(myExpressionBuilder2);

        // Display the ExpressionBuilder count.
        Console.WriteLine("ExpressionBuilder Count: {0}",
          configSection.ExpressionBuilders.Count);

        // Display the ExpressionBuildersCollection details.
        int i = 1;
        int j = 1;
        foreach (ExpressionBuilder expressionBuilder in configSection.ExpressionBuilders)
        {
          Console.WriteLine();
          Console.WriteLine("ExpressionBuilder {0} Details:", i);
          Console.WriteLine("Type: {0}", expressionBuilder.ElementInformation.Type);
          Console.WriteLine("Source: {0}", expressionBuilder.ElementInformation.Source);
          Console.WriteLine("LineNumber: {0}", expressionBuilder.ElementInformation.LineNumber);
          Console.WriteLine("Properties Count: {0}", expressionBuilder.ElementInformation.Properties.Count);
          j = 1;
          foreach (PropertyInformation propertyItem in expressionBuilder.ElementInformation.Properties)
          {
            Console.WriteLine("Property {0} Name: {1}", j, propertyItem.Name);
            Console.WriteLine("Property {0} Value: {1}", j, propertyItem.Value);
            ++j;
          }
          ++i;
        }

        // Remove an ExpressionBuilder.
        configSection.ExpressionBuilders.RemoveAt
          (configSection.ExpressionBuilders.Count-1);

        // Remove an ExpressionBuilder.
        configSection.ExpressionBuilders.Remove("myCustomExpression");

        // Update if not locked.
        if (!configSection.SectionInformation.IsLocked)
        {
          config.Save();
          Console.WriteLine("** Configuration updated.");
        }
        else
        {
          Console.WriteLine("** Could not update, section is locked.");
        }
      }

      catch (Exception e)
      {
        // Unknown error.
        Console.WriteLine(e.ToString());
      }

      // Display and wait.
      Console.ReadLine();
    }
  }
}

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 98, Windows Server 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0
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