页面访问错误转到你设置好的页面根据响应码,错误html页面放在根下,其它随意,配置web.config

<?xml version="1.0" encoding="utf-8"?>
<!--
  有关如何配置 ASP.NET 应用程序的详细信息，请访问
  https://go.microsoft.com/fwlink/?LinkId=169433
-->
<configuration>
  <system.web>
    <compilation debug="true" targetFramework="4.7.2" />
    <httpRuntime targetFramework="4.7.2" />

      <customErrors mode="RemoteOnly" defaultRedirect="MyErrorPage.html"><!--mode="On"都跳转到错误页面,而remoteOnly是客户跳转到错误页面,而程序员是黄页-->
          <error statusCode="403" redirect="NoAccess.html"/>
          <error statusCode="404" redirect="FileNotFound.html"/>
          <!--<error statusCode="500" redirect="ServerCsCodeError.html"/>-->
      </customErrors>
  </system.web>
  <system.codedom>
    <compilers>
      <compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:1659;1699;1701" />
      <compiler language="vb;vbs;visualbasic;vbscript" extension=".vb" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:41008 /define:_MYTYPE=\&quot;Web\&quot; /optionInfer+" />
    </compilers>
  </system.codedom>
    <connectionStrings>
        <add name="connStr" connectionString="server=.;database=MySqlDB;uid=sa;pwd=123;"/>
    </connectionStrings>
</configuration>

见上的web.config的customErrors配置节的位置,敲试就能试出该节在哪个节下

属性:

mode="RemoteOnly" 有on 还有...