string connectionString=System.Configuration.ConfigurationManager.ConnectionStrings["mydata1.Properties.Settings.mydata1ConnectionString"].ConnectionString;
//命名空间 using System.Configuration; //字符串得到的方法1 string MySQLConnectionString=ConfigurationSettings.AppSettings["mydata1.Properties.Settings.mydata1ConnectionString"]; //字符串得到的方法2 string MySQLConnectionString=(ConfigurationSettings.AppSettings["mydata1.Properties.Settings.mydata1ConnectionString"] == "" ? null : ConfigurationSettings.AppSettings["mydata1.Properties.Settings.mydata1ConnectionString"]); //当然app.config如下: <?xml version="1.0"?> <configuration> <appSettings> <!-- 链接字符串 --> <add key="mydata1.Properties.Settings.mydata1ConnectionString" value="Data Source=.;Initial Catalog=mydata1;Integrated ;User ID=sa;Password=11111;Security=True;Pooling=False" providerName="System.Data.SqlClient"/> </appSettings> <runtime> <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1"> <dependentAssembly> <assemblyIdentity name="EnvDTE" publicKeyToken="B03F5F7F11D50A3A" culture="neutral"/> <bindingRedirect oldVersion="0.0.0.0-8.0.0.0" newVersion="8.0.0.0"/> </dependentAssembly> </assemblyBinding> </runtime> </configuration>