c# – 检查重复项并从DataTable中删除数据库表的好方法？

我的代码中有一个填充的DataTable：

我正在使用sql Server CE 4.0并解决性能问题,我正在使用sqlCeBulkcopy：

sqlCeBulkcopyOptions options = new sqlCeBulkcopyOptions();
options = options |= sqlCeBulkcopyOptions.KeepNulls;

// Check for DB duplicates
using (sqlCeBulkcopy bc = new sqlCeBulkcopy(strConn,options))
{
    dt = RemoveDuplicateRows(dt,"Email");
    bc.DestinationTableName = "Recipients";
    bc.WritetoServer(dt);
}

RemoveDuplicateRows将从DataTable中删除重复项,但不会检查数据库中已存在的内容.

我想在将其传递给WritetoServer(dt)之前,有效地删除DataTable中存在于实际数据库表中的所有项.

什么是这个问题的良好性能,成本效益的解决方案？

解决方法

那么你需要对数据表和现有表格进行调整吗？我不确定sql ce是否支持临时表,我用ms sql做了类似的事情,这里是伪代码

string tmpTableDeFinition = "create table #tmpEmails (...)";
using(var connection = new sqlCeConnection(connectionString))
{
    //Create temp table
    var tmpTableCommand = new sqlCeCommand(tmpTableDefiniton,connection);
    tmpTableCommand.ExecuteNonQuery();
    //Bulk copy to the temp table,note that bulk copy run faster if the teble is empty
    //which is always true in this case...
    using (var bc = new sqlCeBulkcopy(connection,options))
    {
         bc.DestinationTableName = "#tmpEmails";
         bc.WritetoServer(dt);
    }
    //Run a sp,that have temp table and original one,and marge as you wish in sql
    //for sp to compile properly,you would have to copy tmp table to script too
    var spCommand = new sqlCommand("sp_MargeTempEmailsWithOriginal",connection);
    spCommand.Type = SP //Don't remember exact prop name and enum value
    spCommand.ExecuteNonQuery();
}