【问题处理】Unable to cast object of type 'System.DBNull' to type 'System.String'.
2017-07-05 16:45
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问题
【.net报错】Unable to cast object of type 'System.DBNull' to type 'System.String'.解决
if (objOperation != System.DBNull.Value){
e.Text = (string)objOperation;
}
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