How can I select a row from a datatable using two variable values?

问题

Alright, so what I'm attempting to do here, is select from a datatable all the rows that match two variables. First, I queried a SPList into a datatable. The datatable has two columns, Client ID, and Model Details. Here's some of the code, so hopefully you can get an idea of what I'm attempting.

//These are contained within a foreach loop, so will be different through each
//iteration through.
int iClientID = gdbData.GetClientID(iJobNumberID);
string strModelDetails = xeApprovalUpdate.GetAttribute("ModelDetails");
string strClientID = iClientID.ToString()
//Here my datatable is populated from the sharepoint list I query
DataTable dtabModelDetails = queryModelDetails(splModelDetails);
DataRow[] drModelDetails = dtabModelDetails.Select(strClientID, strModelDetails);

Seeing as that didn't work, I attempted to do the following select statement:

DataTable dtabModelDetails = queryModelDetails(splModelDetails);
string strDataExpression = "ClientID = " + strClientID + " AND Title = " + strModelDetails;
DataRow[] drModelDetails = dtabModelDetails.Select(strDataExpression);

Now I'm getting a syntax error for the select statement, but I'm pretty sure my syntax is correct? Would I get this error if my select statement returned no rows?

回答1:

Yes, you can add where clause to the DataTable Select method like this....

DataRow[] drModelDetails = dtabModelDetails.Select("Client ID = '" + clientId + "' AND Model Details = '" + modelDetails + "'");

回答2:

Yes, you can add parameters to the SqlCommand object. Add one param for each param in your select statement.

Also, if you have spaces in your column names, you need to put them in brackets.

    DataRow[] drModelDetails = dtabModelDetails.Select("[Client ID] = @ClientID AND [Model Details] =@ModelDetails")

    cmd.Parameters.Add(new SqlParameter("@ClientID", ClientID));
    cmd.Parameters.Add(new SqlParameter("@ModelDetails", ModelDetails));

来源：https://stackoverflow.com/questions/6363448/how-can-i-select-a-row-from-a-datatable-using-two-variable-values