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