C# 数据网格视图，SQL Server：选择多行，然后将具有指定列的选定行插入到 SQL 表中

Question

In my current application I have a snippet of code that allows me to select a single row in a data grid view and store all the columns information into a variable to do with what I want. I use this primarily to send information from one SQL database table to another. It's great for only sending specified cells within a row.

Here is how I do a single row:

string ID = dataGridView1.SelectedRows[0].Cells[0].Value + string.Empty;
            string itemOne= dataGridView1.SelectedRows[0].Cells[1].Value + string.Empty;
            string itemTwo= dataGridView1.SelectedRows[0].Cells[2].Value + string.Empty;
            string itemThree= dataGridView1.SelectedRows[0].Cells[3].Value + string.Empty;


            var vItemOne = itemOne;
            var vItemTwo= itemTwo;
            var vItemThree= itemThree;
            // ETC..

However, I now want to be able to select Multiple Rows and only insert specified columns within those rows to a SQL database.

I've tried modifying the above code to work... obviously it doesn't work.

I believe I need a loop, I haven't really used loops much so I'm not sure how to make it loop, skip certain columns, then insert into database.

This is what I am currently attempting, however I seem to be messing up somewhere.

using (SqlConnection con = new SqlConnection(Connection.MTRDataBaseConn))
            {

            for (int i = 0; i < dataGridView1.SelectedRows.Count; i++)
            {
                con.Open();
                SqlCommand cmd = new SqlCommand();
                cmd.CommandText = "INSERT INTO dbo.[" + txtJobName.Text + "] ([Item One], [Item Two], [Item Three]) VALUES(@ItemOne,@ItemTwo,@ItemThree)";

                cmd.Connection = con;

                string strItemOne = this.dataGridView1.SelectedRows[i].Cells[1].Value + string.Empty;
                string strItemTwo = this.dataGridView1.SelectedRows[i].Cells[2].Value + string.Empty;
                string strItemThree = this.dataGridView1.SelectedRows[i].Cells[3].Value + string.Empty;


                //Parameters
                cmd.Parameters.AddWithValue("@ItemOne", strItemOne);
                cmd.Parameters.AddWithValue("@ItemTwo", strItemTwo);
                cmd.Parameters.AddWithValue("@ItemThree", strItemThree);

                //execute
                cmd.ExecuteNonQuery();

                //close connection
                con.Close();
            }
        }

...

While Debugging My dataGridView.SelectedRows.Count; i++ dataGridView.SelectedRows.Count; i++ doesn't seem to be increasing and is staying at 0... I'm receiving the error when I try to return the selected row to a string. Shouldn't my selected rows still return a value?

I'm under the assumption my loop is wrong.

Can anyone help me with my issue?

Answer 1

Simply have to use a for each statement

string itemOne= dataGridView1.SelectedRows[0].Cells[1].Value + string.Empty;
string itemTwo= dataGridView1.SelectedRows[0].Cells[2].Value + string.Empty;
string itemThree= dataGridView1.SelectedRows[0].Cells[3].Value + string.Empty;

var vItemOne = itemOne;
var vItemTwo= itemTwo;
var vItemThree= itemThree;

foreach (DataGridViewRow row in dataGridView1.SelectedRows)
{
    //Insert Query Here
}