将 DataGridView 数据保存到 SQL Server 数据库 Winform

Question

这是 UI 的示例图像：

我正在开发一个项目，该项目将导入 Excel 文件并通过 Windows 窗体将数据显示到 DataGridView。 导入 Excel 文件并将其显示在 DataGridView 中工作正常，我遇到的问题是当我单击“保存”按钮时将 DataGridView 中的数据保存为批量插入，它显示一个

错误截图：

System.Data.dll 中发生类型为“System.ArgumentException”的未处理异常

当我查看详细信息时，它显示：

不存在从对象类型 System.Windows.Forms.DataGridViewTextBoxColumn 到已知托管提供程序本机类型的映射。

代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

using System.Data.OleDb;
using System.Data.SqlClient;

保存按钮代码

     private void btn_Save_Click(object sender, EventArgs e)
        {

            foreach (DataGridViewRow row in dataGridView1.Rows)
            {
                string constring = @"Data Source=databasename;Initial Catalog=Rookies;Integrated Security=True";

                using(SqlConnection con = new SqlConnection(constring))
                {
                    using (SqlCommand cmd = new SqlCommand("INSERT INTO tbl_prospects ([prospectid], [firstname], [lastname], [height], [weight], [age], [college])VALUES(@prospectid, @firstname, @lastname, @height, @weight, @age, @college)", con))
                    {
                        cmd.Parameters.AddWithValue("@prospectid", prospectidDataGridViewTextBoxColumn);
                        cmd.Parameters.AddWithValue("@firstname", firstnameDataGridViewTextBoxColumn);
                        cmd.Parameters.AddWithValue("@lastname", lastnameDataGridViewTextBoxColumn);
                        cmd.Parameters.AddWithValue("@height", heightDataGridViewTextBoxColumn);
                        cmd.Parameters.AddWithValue("@weight", weightDataGridViewTextBoxColumn);
                        cmd.Parameters.AddWithValue("@age", ageDataGridViewTextBoxColumn);
                        cmd.Parameters.AddWithValue("@college", collegeDataGridViewTextBoxColumn);

                        con.Open();
                        cmd.ExecuteNonQuery();
                        con.Close();
                    }
                }
            }
            MessageBox.Show("Successfully Saved!");
        }



    }
}

我还包括下面的其他代码

浏览按钮代码

  private void btn_Browse_Click(object sender, EventArgs e)
    {
        OpenFileDialog openFileDialog1 = new OpenFileDialog();

        if (openFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
        {
            this.txt_Path.Text = openFileDialog1.FileName;
        }
    }

加载按钮代码

  private void btn_Load_Click(object sender, EventArgs e)
    {
        string PathConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + txt_Path.Text + ";Extended Properties=\"Excel 8.0;HDR=Yes;\";";
        OleDbConnection conn = new OleDbConnection(PathConn);

        OleDbDataAdapter myDataAdapter = new OleDbDataAdapter("Select * from [" + txt_Sheet.Text + "$]", conn);
        DataTable DT = new DataTable();

        myDataAdapter.Fill(DT);

        dataGridView1.DataSource = DT;
    }

我是 C# 编码新手并试图学习它，这将是我的第一个应用程序，如果有人可以帮助我，我需要提前感谢。

Answer 1

您可以直接使用SqlBulkCopy 将数据表写入Sql Server，而不是逐行进行。

string constring = @"Data Source=databasename;Initial Catalog=Rookies;Integrated Security=True";

using (var bulkCopy = new SqlBulkCopy(constring ))
{
      bulkCopy.BatchSize = 500;
      bulkCopy.NotifyAfter = 1000;

      bulkCopy.DestinationTableName = "TableName";
      bulkCopy.WriteToServer(dataTable);
 }

还有各种 SqlBulkCopy 构造函数来传递 SqlConnection 和 SqlTransaction。

Answer 2

您可以像这样从每一行获取值

foreach (DataGridViewRow row in dataGridView.Rows)
{
    // your code

    cmd.Parameters.AddWithValue("@prospectid",row.Cells["ColumnName"].Value.ToString());
}

Answer 3

我的第一句话：只使用1次对象SqlConnextion，现在最好添加SqlTransaction对象，以避免在一行DataGridView出错时部分记录数据。 对于答案，您需要指定每列的单元格的值

private void btn_Save_Click(object sender, EventArgs e)
{
    string constring = @"Data Source=databasename;Initial Catalog=Rookies;Integrated Security=True";
    SqlConnection con = new SqlConnection(constring);
    SqlTransaction transaction = con.BeginTransaction();
    try
    {
        con.Open();
        foreach (DataGridViewRow row in dataGridView1.Rows)
        {
            using (SqlCommand cmd = new SqlCommand("INSERT INTO tbl_prospects ([prospectid], [firstname], [lastname], [height], [weight], [age], [college])VALUES(@prospectid, @firstname, @lastname, @height, @weight, @age, @college)", con))
            {
                cmd.Parameters.AddWithValue("@prospectid", row.Cells["prospectid"].Value);
                cmd.Parameters.AddWithValue("@firstname", row.Cells["firstname"].Value);
                cmd.Parameters.AddWithValue("@lastname", row.Cells["lastname"].Value);
                cmd.Parameters.AddWithValue("@height", row.Cells["height"].Value);
                cmd.Parameters.AddWithValue("@weight", row.Cells["weight"].Value);
                cmd.Parameters.AddWithValue("@age", row.Cells["age"].Value);
                cmd.Parameters.AddWithValue("@college", row.Cells["college"].Value);
                cmd.Transaction = transaction;
                cmd.ExecuteNonQuery();
            }
        }
        transaction.Commit();
        con.Close();
        MessageBox.Show("Successfully Saved!");
    }
    catch (Exception ex)
    {
        transaction.Rollback();
        con.Close();
        MessageBox.Show(ex.Message);
    }
}

Answer 4

private void btn_Insert_Click(object sender, EventArgs e)
    {
        if (txtSearsh.Text != "")
        {
            if (dataGridView1.Rows.Count > 0)
            {
                for (int i = 0; i < dataGridView1.Rows.Count ; i++)
                {
                        COI.INSERTdATA(txtSearsh.Text,
                        dataGridView1.CurrentRow.Cells["COIL_NO"].Value.ToString(),
                        dataGridView1.CurrentRow.Cells["SLAB_NO"].Value.ToString(),
                        dataGridView1.CurrentRow.Cells["ORDER_NO"].Value.ToString(),
                        dataGridView1.CurrentRow.Cells["ORDER_NO"].Value.ToString(),
                        dataGridView1.CurrentRow.Cells["ITEM_NO"].Value.ToString(),
                        dataGridView1.CurrentRow.Cells["PROD_TYPE"].Value.ToString(),
                        dataGridView1.CurrentRow.Cells["GRADE"].Value.ToString(),
                        dataGridView1.CurrentRow.Cells["SL_THICK"].Value.ToString(),
                        dataGridView1.CurrentRow.Cells["SL_WIDTH"].Value.ToString(),
                        dataGridView1.CurrentRow.Cells["SL_LENGTH"].Value.ToString(),
                        dataGridView1.CurrentRow.Cells["SL_WGHT"].Value.ToString(),
                        dataGridView1.CurrentRow.Cells["C_THICK"].Value.ToString(),
                        dataGridView1.CurrentRow.Cells["C_WIDTH"].Value.ToString(),
                        dataGridView1.CurrentRow.Cells["C_WT"].Value.ToString(),
                        dataGridView1.CurrentRow.Cells["PRODUCED"].Value.ToString(), "", "", "", "", "", "", DTP.Value, "", "", "", "", "", ""
                        );
                    
                }
                MessageBox.Show("SaccessFouly");
            }
            else { MessageBox.Show("أدخل رقم البرنامج"); }
        }
    }