98 lines
4.1 KiB
C#
98 lines
4.1 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="ConnectionStringsExpressionBuilder.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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//------------------------------------------------------------------------------
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namespace System.Web.Compilation {
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using System;
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using System.Security.Permissions;
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using System.CodeDom;
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using System.Configuration;
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using System.Globalization;
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using System.Web.UI;
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[ExpressionPrefix("ConnectionStrings")]
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[ExpressionEditor("System.Web.UI.Design.ConnectionStringsExpressionEditor, " + AssemblyRef.SystemDesign)]
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public class ConnectionStringsExpressionBuilder : ExpressionBuilder {
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public override bool SupportsEvaluate {
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get {
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return true;
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}
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}
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public override object ParseExpression(string expression, Type propertyType, ExpressionBuilderContext context) {
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// This code is also copied in ConnectionStringsExpressionEditor.ParseExpression()
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const string connectionStringSuffix = ".connectionstring";
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const string providerNameSuffix = ".providername";
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string name = String.Empty;
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bool connectionString = true;
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if (expression != null) {
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if (expression.EndsWith(connectionStringSuffix, StringComparison.OrdinalIgnoreCase)) {
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name = expression.Substring(0, expression.Length - connectionStringSuffix.Length);
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}
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else {
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if (expression.EndsWith(providerNameSuffix, StringComparison.OrdinalIgnoreCase)) {
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connectionString = false;
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name = expression.Substring(0, expression.Length - providerNameSuffix.Length);
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}
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else {
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name = expression;
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}
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}
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}
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return new Pair(name, connectionString);
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}
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public override CodeExpression GetCodeExpression(BoundPropertyEntry entry,
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object parsedData, ExpressionBuilderContext context) {
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Pair p = (Pair)parsedData;
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string name = (string)p.First;
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bool connectionString = (bool)p.Second;
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if (connectionString) {
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return new CodeMethodInvokeExpression(new CodeTypeReferenceExpression(this.GetType()), "GetConnectionString", new CodePrimitiveExpression(name));
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}
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else {
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return new CodeMethodInvokeExpression(new CodeTypeReferenceExpression(this.GetType()), "GetConnectionStringProviderName", new CodePrimitiveExpression(name));
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}
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}
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public override object EvaluateExpression(object target, BoundPropertyEntry entry,
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object parsedData, ExpressionBuilderContext context) {
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Pair p = (Pair)parsedData;
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string name = (string)p.First;
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bool connectionString = (bool)p.Second;
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ConnectionStringSettings setting = ConfigurationManager.ConnectionStrings[name];
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if (connectionString) {
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return GetConnectionString(name);
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}
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else {
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return GetConnectionStringProviderName(name);
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}
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}
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public static string GetConnectionStringProviderName(string connectionStringName) {
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ConnectionStringSettings setting = ConfigurationManager.ConnectionStrings[connectionStringName];
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if (setting == null) {
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throw new InvalidOperationException(SR.GetString(SR.Connection_string_not_found, connectionStringName));
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}
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return setting.ProviderName;
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}
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public static string GetConnectionString(string connectionStringName) {
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ConnectionStringSettings setting = ConfigurationManager.ConnectionStrings[connectionStringName];
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if (setting == null) {
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throw new InvalidOperationException(SR.GetString(SR.Connection_string_not_found, connectionStringName));
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}
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return setting.ConnectionString;
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}
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}
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}
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