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//方法一:加入名称空间:
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using System.Configuration;
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//然后
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string strDbConn = new AppSettingsReader().GetValue("dbconn", typeof(string)).ToString();
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//方法二:添加引用:(system.configuration)加入名称空间
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using System.Configuration;
7 string strDbConn = ConfigurationManager.AppSettings["dbconn"];

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7 string strDbConn = ConfigurationManager.AppSettings["dbconn"];