如何将内容从一个单元格复制到另一个单元格

Question

我正在尝试检查是否有任何 column1，任何单元格不为空。我想让然后清空并将文件复制到下一个列单元格。什么，我的想法是检查一个特定的 Column1-所有单元格是否可以说“COLUMN1”其中一个单元格不为空。然后我需要将文件 [我已将文件路径附加到该特定单元格] 复制到下一个 column2。同时我想将文件复制到桌面上的文件夹假设位置是 C:/user/elec/copy，我想擦除 Column1 -cell 数据。

我该怎么做。链接我正在尝试做的事情..

编辑编码.....

 private void button6_Click(object sender, EventArgs e)
    {
            string copyPath = @"C:\user\elec\copy";
            if (!System.IO.Directory.Exists(copyPath))
                System.IO.Directory.CreateDirectory(copyPath);
            for (int i = 0; i < dataGridView1.Rows.Count; i++)
            {
                if (dataGridView1.Rows[i].Cells[2].Value != null && !String.IsNullOrEmpty(dataGridView1.Rows[i].Cells[2].Value.ToString()))
                {
                    string filePath = dataGridView1.Rows[i].Cells[2].Value.ToString();
                    if (System.IO.File.Exists(filePath))
                    {
                        string fileName = System.IO.Path.GetFileName(filePath);
                        string newpath = System.IO.Path.Combine(copyPath, fileName);
                        System.IO.File.Copy(filePath, newpath, true);
                        dataGridView1.Rows[i].Cells[3].Value = newpath;

                        try
                        {
                            SqlConnection con = new SqlConnection(@"Data Source=SREEJITHMOHA492\SQLEXPRESS;Initial Catalog=cndb;Integrated Security=True");
                            {
                                con.Open();
                                SqlCommand cmd = con.CreateCommand();
                                cmd.CommandText = "update cncinfo set draftpath=@draftpath,releasepath=@releasepath Where part=@part";
                                cmd.Parameters.Add("@draftpath", SqlDbType.NVarChar).Value = filePath;
                                cmd.Parameters.Add("@releasepath", SqlDbType.NVarChar).Value = newpath;
                                cmd.CommandText = "update cncinfo set draftpath='" + string.Empty + "',releasepath=@releasepath Where part=@part";
                                //you must have the id value in datagridview to update the specific record.
                                cmd.Parameters.Add("@part", SqlDbType.NVarChar).Value = Convert.ToString(dataGridView1.Rows[i].Cells["Part Number"].Value);
                                cmd.ExecuteNonQuery();
                                con.Close();
                            }
                        }
                        catch (System.Exception ex)
                        {
                            MessageBox.Show(ex.Message);
                        }
                    }
                    dataGridView1.Rows[i].Cells[2].Value = string.Empty;
                }
            }
    }

Answer 1

你的代码有很多问题。您正在尝试阅读 DataGridViewCell 而不是它的值。要读取单元格值，您必须从DataGridVIewCell 的.Value 属性返回值。 IE。 string x=dgv.Rows[0].Cells[1].Value。行不包含列，它包含单元格。因此，要从特定单元格中读取值，您应该从 Cell 对象而不是 Column 中读取该值。

private void button6_Click(object sender, EventArgs e)
{
    string copyPath = @"C:\user\elec\copy";
    if (!System.IO.Directory.Exists(copyPath))
        System.IO.Directory.CreateDirectory(copyPath);
    for (int i = 0; i < dataGridView1.Rows.Count; i++)
    {
        if (dataGridView1.Rows[i].Cells[0].Value != null && 
            !String.IsNullOrEmpty(dataGridView1.Rows[i].Cells[0].Value.ToString()))
        {
            string filePath = dataGridView1.Rows[i].Cells[0].Value.ToString();
            if (System.IO.File.Exists(filePath))
            {                   
                string fileName = System.IO.Path.GetFileName(filePath);
                string newpath = System.IO.Path.Combine(copyPath, fileName);
                System.IO.File.Copy(filePath, newpath, true);
                dataGridView1.Rows[i].Cells[1].Value = newpath;

                try
                { 
                    Using (SqlConnection con = new SqlConnection(@"Data Source=STACY121\SQLEXPRESS;Initial Catalog=cndb;Integrated Security=True"))
                    {
                        con.Open();
                        SqlCommand cmd = con.CreateCommand();
                        cmd.CommandText = "update cncinfo set Column1=@Column1,Column2=@Column2 Where id=@id";
                        cmd.Parameters.Add("@Column1",SqlDbType.VarChar).Value =filePath;
                        cmd.Parameters.Add("@Column2",SqlDbType.VarChar).Value =newpath;
                        //you must have the id value in datagridview to update the specific record.
                        cmd.Parameters.Add("@id",SqlDbType.Int).Value =Convert.ToInt32(dataGridView1.Rows[i].Cells["id"].Value);


                        cmd.ExecuteNonQuery();
                        con.Close();
                    }
                 }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);
                } 
            }
            dataGridView1.Rows[i].Cells[0].Value = string.Empty;
        }
    }
}

已编辑：

如果你想用不同的文件名复制，那么你可以像这样指定文件名。

int iFileNo = 1; // this is the part of file number in sample-rev-01
string fileName = System.IO.Path.GetFileName(filePath);
string ext = new System.IO.FileInfo(filePath).Extension;
//if the file name is sample.txt then it would be return as sample-rev-01.txt
fileName = String.Format("{0}-rev-{1:00}{2}", fileName.Replace(ext, ""), iFileNo, ext);

string newpath = System.IO.Path.Combine(copyPath, fileName);
System.IO.File.Copy(filePath, newpath, true);