Question

我在C＃中有一个DataTable，并希望将它发送到我的SQL CE 4服务器。使其更复杂的一件事是，当它遇到重复时，它应该忽略它并继续前进到DataTable中的下一行。我环顾四周，但我发现很多信息似乎与CE版的CE版本无关。这样做的有效方法是什么？

Answer 1

使用DataTable.Select方法

过滤您的DataTable，以便在上传前排除重复的行

e.g。

    DataTable table = DataSet1.Tables["Orders"];

    // Presuming the DataTable has a column named Date.
    string expression;
    expression = "Date > #1/1/00#"; // you will need logic to remove your duplicates
    DataRow[] foundRows;

    // Use the Select method to find all rows excluding duplicates
    foundRows = table.Select(expression);

    // .NET 3.5 onwards
    DataTable filteredDataTable = foundRows.copyToDataTable();

Answer 2

试试这个逻辑。

 var dt = new DataTable(); //Supposed that this is your DataTable

 foreach(DataRow row in dt.Rows)
    {

      var find = MyFindMethod("Id"); 1. select statement that find if the id is on database

       if(find.Rows > 0)
          {
            //Id exist do nothing
          }
       else
          {
             //Id not exist then 2. Do Insert to sql ce id I not exist
            MyInsertMethod("Id"); 
          }  
    }

此致

DataTable到SQL CE 4服务器

2 个答案: