System.Configuration.ConfigurationErrorsException: 项“ ”已添加。

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System.TypeInitializationException: “Model”的类型初始值设定项引发异常。 ---> System.Configuration.ConfigurationErrorsException: 项“Sql”已添加。

在该连接的WebConfig 中前添加<clear />

如下

System.Configuration.ConfigurationErrorsException: 项“ ”已添加。
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