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PubConstant.cs不能获取到WEB.CONFIG 文件中的数据库连接字符串

using System; 
using System.Configuration; 
namespace Maticsoft.DBUtility 

    ///  
    /// 公共工具类 
    ///  
    public class PubConstant 
    {         
        ///  
        /// 获取固定连接字符串 
        ///  
        public static string ConnectionString 
        {            
            get  
            {
                string _connectionString = ConfigurationManager.AppSettings["ConnectionString"];        
                string ConStringEncrypt = ConfigurationManager.AppSettings["ConStringEncrypt"]; 
                if (ConStringEncrypt == "true") 
                { 
                    _connectionString = DESEncrypt.Decrypt(_connectionString); 
                } 
                return _connectionString;  
            } 
        } 
 
        ///  
        /// 动态得到web.config里配置项的数据库连接字符串。 
        ///  
        ///  
        ///  
        public static string GetConnectionString(string configName) 
        { 
            string connectionString = ConfigurationManager.AppSettings[configName]; 
            string ConStringEncrypt = ConfigurationManager.AppSettings["ConStringEncrypt"]; 
            if (ConStringEncrypt == "true") 
            { 
                connectionString = DESEncrypt.Decrypt(connectionString); 
            } 
            return connectionString; 
        } 
 
 
    } 



--------------------编程问答-------------------- web.config 文件 
<?xml version="1.0"?>
<!-- 
    注意: 除了手动编辑此文件以外,您还可以使用 
    Web 管理工具来配置应用程序的设置。可以使用 Visual Studio 中的
     “网站”->“Asp.Net 配置”选项。
    设置和注释的完整列表在 
    machine.config.comments 中,该文件通常位于 
    \Windows\Microsoft.Net\Framework\v2.x\Config 中
-->
<configuration>
<configSections>
    <section name="rewriter" requirePermission="false" type="Intelligencia.UrlRewriter.Configuration.RewriterConfigurationSectionHandler, Intelligencia.UrlRewriter" />
    <sectionGroup name="system.web.extensions" type="System.Web.Configuration.SystemWebExtensionsSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
<sectionGroup name="scripting" type="System.Web.Configuration.ScriptingSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
<section name="scriptResourceHandler" type="System.Web.Configuration.ScriptingScriptResourceHandlerSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/>
<sectionGroup name="webServices" type="System.Web.Configuration.ScriptingWebServicesSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
<section name="jsonSerialization" type="System.Web.Configuration.ScriptingJsonSerializationSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="Everywhere"/>
<section name="profileService" type="System.Web.Configuration.ScriptingProfileServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/>
<section name="authenticationService" type="System.Web.Configuration.ScriptingAuthenticationServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/>
<section name="roleService" type="System.Web.Configuration.ScriptingRoleServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/>
</sectionGroup>
</sectionGroup>
</sectionGroup>
</configSections>
<appSettings/>
<connectionStrings>
  <add name="ConnectionString" connectionString="Data Source=localhost;database=cuowukuDB;uid=start;pwd=start.1989" providerName="System.Data.SqlClient" />
  </connectionStrings>
<system.web>
<!-- 
            设置 compilation debug="true" 可将调试符号插入
            已编译的页面中。但由于这会 
            影响性能,因此只在开发过程中将此值 
            设置为 true。
        -->
    <compilation debug="true">
<assemblies>
<add assembly="System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
<add assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
<add assembly="System.Data.DataSetExtensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
<add assembly="System.Xml.Linq, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
<add assembly="System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
<add assembly="System.Web.Extensions.Design, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
<add assembly="System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/></assemblies>
</compilation>
<!--
            通过 <authentication> 节可以配置 ASP.NET 用来 
            识别进入用户的
            安全身份验证模式。 
        -->
<authentication mode="Windows"/>
<!--
            如果在执行请求的过程中出现未处理的错误,
            则通过 <customErrors> 节可以配置相应的处理步骤。具体说来,
            开发人员通过该节可以配置
            要显示的 html 错误页
            以代替错误堆栈跟踪。

        <customErrors mode="RemoteOnly" defaultRedirect="GenericErrorPage.htm">
            <error statusCode="403" redirect="NoAccess.htm" />
            <error statusCode="404" redirect="FileNotFound.htm" />
        </customErrors>
        -->
<pages>
<controls>
<add tagPrefix="asp" namespace="System.Web.UI" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
<add tagPrefix="asp" namespace="System.Web.UI.WebControls" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
</controls>
</pages>
<httpHandlers>
<remove verb="*" path="*.asmx"/>
<add verb="*" path="*.asmx" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
<add verb="*" path="*_AppService.axd" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
<add verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" validate="false"/>
    </httpHandlers>
<httpModules>
<add name="ScriptModule" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
      <add type="Intelligencia.UrlRewriter.RewriterHttpModule, Intelligencia.UrlRewriter" name="UrlRewriter" />
    </httpModules>
</system.web>
  <rewriter>
    <rewrite url="~/2010_(.+).html$" to="~/Question.aspx?id=$1" />
    <rewrite url="~/Answer_2010_(.+).html$" to="~/Answer.aspx?id=$1" />
    <rewrite url="~/Notice_2010_(.+).html$" to="~/Notice.aspx?id=$1" />
    <rewrite url="~/SSortList_2010_(.+).html$" to="~/SSortList.aspx?ssid=$1" />
    <rewrite url="~/cuowu.html$" to="~/cuowu.aspx" />
    <rewrite url="~/SearchQuestionList.html" to="~/SearchQuestionList.aspx" />
    <rewrite url="~/QuestionList.html$" to="~/QuestionList.aspx" />
    <rewrite url="~/index.html$" to="~/index.aspx" />
    <rewrite url="~/NoReplyQuestion.html$" to="~/NoReplyQuestion.aspx" />
  </rewriter>
<system.codedom>
<compilers>
<compiler language="c#;cs;csharp" extension=".cs" warningLevel="4" type="Microsoft.CSharp.CSharpCodeProvider, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
<providerOption name="CompilerVersion" value="v3.5"/>
<providerOption name="WarnAsError" value="false"/>
</compiler>
<compiler language="vb;vbs;visualbasic;vbscript" extension=".vb" warningLevel="4" type="Microsoft.VisualBasic.VBCodeProvider, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
<providerOption name="CompilerVersion" value="v3.5"/>
<providerOption name="OptionInfer" value="true"/>
<providerOption name="WarnAsError" value="false"/>
</compiler>
</compilers>
</system.codedom>
<!-- 
        在 Internet 信息服务 7.0 下运行 ASP.NET AJAX 需要 system.webServer
        节。对早期版本的 IIS 来说则不需要此节。
    -->
<system.webServer>
<validation validateIntegratedModeConfiguration="false"/>
<modules>
<remove name="ScriptModule"/>
<add name="ScriptModule" preCondition="managedHandler" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
</modules>
<handlers>
<remove name="WebServiceHandlerFactory-Integrated"/>
<remove name="ScriptHandlerFactory"/>
<remove name="ScriptHandlerFactoryAppServices"/>
<remove name="ScriptResource"/>
<add name="ScriptHandlerFactory" verb="*" path="*.asmx" preCondition="integratedMode" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
<add name="ScriptHandlerFactoryAppServices" verb="*" path="*_AppService.axd" preCondition="integratedMode" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
<add name="ScriptResource" preCondition="integratedMode" verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
</handlers>
</system.webServer>
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
<assemblyIdentity name="System.Web.Extensions" publicKeyToken="31bf3856ad364e35"/>
<bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="3.5.0.0"/>
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.Extensions.Design" publicKeyToken="31bf3856ad364e35"/>
<bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="3.5.0.0"/>
</dependentAssembly>
</assemblyBinding>
</runtime>
  <!--UrlRewriter-->
</configuration>
各位大虾 看看我是什么地方写错了  不能获取数据库连接字符串 --------------------编程问答-------------------- 汗  没人在啊? --------------------编程问答-------------------- string _connectionString = System.Web.Configuration.WebConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString; --------------------编程问答--------------------  谢谢3楼 我试试  --------------------编程问答-------------------- 你根本就没有写在Appsetting节点中,而是写在了ConnectionStrings 节点中,你又如何能够获取到 --------------------编程问答-------------------- string _connectionString = Configuration.WebConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString; --------------------编程问答--------------------
引用 5 楼 aganar 的回复:
你根本就没有写在Appsetting节点中,而是写在了ConnectionStrings 节点中,你又如何能够获取到


正解 --------------------编程问答--------------------
补充:.NET技术 ,  ASP.NET
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