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var query = from info in ds.Tables[0].AsEnumerable() where info.Field<string>("告警类别") == "寿命预警" select info;
DataTable dt = query.CopyToDataTable<DataRow>();
if(query.Any()){
DataTable dt = query.CopyToDataTable<DataRow>();
}
if(query.Count() > 0){
DataTable dt = query.CopyToDataTable<DataRow>();
}