C# 如何将gridview中的值插入数据库

我在SQL Server数据库中有两个表。我从table

ADMS

中选择，我需要通过gridview插入主表，但我不知道如何使用gridview插入。请帮忙。我已经试了很多天了，但还没有通过

protected void Button3_Click1(object sender, EventArgs e)
{
    if (RadioButton2.Checked)
    {
        SqlConnection con = new SqlConnection(MyConnectionString);
        // con.Open(); // don't need the Open, the Fill will open and close the connection automatically
        SqlDataAdapter da = new SqlDataAdapter("SELECT * FROM ADMS_Machining where datetime='" + TextBox1.Text + "'", con);
        mytable = new DataTable();
        da.Fill(mytable);
        GridView2.DataSource = mytable;
        GridView2.DataBind();
    }
    else
    {
        SqlConnection con = new SqlConnection(MyConnectionString);
        // con.Open(); // don't need the Open, the Fill will open and close the connection automatically
        SqlDataAdapter da = new SqlDataAdapter("SELECT * FROM Machining_Master where datetime='" + TextBox1.Text + "'", con);
        mytable = new DataTable();
        da.Fill(mytable);
        GridView2.DataSource = mytable;
        GridView2.DataBind();
    }
}

protected void Button4_Click(object sender, EventArgs e)
{
    SqlConnection conn = new SqlConnection();
    SqlCommand cmd = new SqlCommand();
    String strConnString, strSQL;

    strConnString = "Server=kane-pc;UID=sa;PASSWORD=1234;Database=Machining;Max Pool Size=400;Connect Timeout=600;";
   //here

   conn.ConnectionString = conn;
   conn.Open();
   cmd.Connection = conn;
   cmd.CommandText = strSQL;
}

---

您必须首先从单元格中读取数据，然后使用SqlCommand将其插入数据库。 假设在加工主表中有M_ID和M_NAME列，则可以按如下方式向数据库插入值：

//Assuming that your id column is first column and name is second column
//get value of id and name
int mId = Convert.ToInt32(GridView2.SelectedRow.Cells[0].Text);
string mName = GridView2.SelectedRow.Cells[1].Text;

string connectionStrng = "your connection string";
string insertSql = "INSERT INTO Machining_Master (M_ID, M_NAME) VALUES (@mId, @mName)";
using (SqlConnection conn = new SqlConnection(connectionStrng))
{
    using (SqlCommand cmd = new SqlCommand(insertSql, conn))
    {
        try
        {
            cmd.Parameters.Add(new SqlParameter("mId", mId));
            cmd.Parameters.Add(new SqlParameter("mName", mName));

            conn.Open();
            cmd.ExecuteNonQuery();
        }
        finally
        {
            //Close connection
            conn.Close();
        }
    }
}

---

您可以从栅格视图中提取值，具体取决于您在单元格中放置的内容

string value = this.GridView2.Rows[0].Cells[0].Text;

您还可以跟踪选定的行事件，并获得如下特定控件

protected void OnSelectedIndexChanged(object sender, EventArgs e)
{  
    string someValueTakenFromLabel = (GridView2.SelectedRow.FindControl("lblAnyLabelHere") as Label).Text;

    // .... do something with value here
}

不过，我建议您通过一些教程了解如何使用GridView

---

我如何理解错误{“对象引用未设置为对象的实例。”}Double dailyman=Convert.ToDouble（GridView2.SelectedRow.Cells[0].Text）；Double Process_Mean=Convert.ToDouble（GridView2.SelectedRow.Cells[1].Text）；Double Long\u Term\u Stdev=Convert.ToDouble（GridView2.SelectedRow.Cells[2].Text）；Double CPK_ESTIMATE=Convert.ToDouble（GridView2.SelectedRow.Cells[3].Text）；Double DAILY_MINIMUM=Convert.ToDouble（GridView2.SelectedRow.Cells[4].Text）；Double DAILY_MAXIMUM=Convert.ToDouble（GridView2.SelectedRow.Cells[5].Text）；您选择了一行吗？如果它适合您，请不要忘记接受它作为答案@kanesmith可能重复的