[英]C# save DataGridView after editing (overwrite Excel file that was imported)
我有一个小表格,其中有3个Buttons
( Browse
& updateExcel
和saveExcel
), ComboBox
( comboBox1
)和DataGridView
( dataGridView1
)
第一个按钮使您可以选择一个Excel文件,然后将该文件加载到DataGridView
:
private void Browse_Click(object sender, EventArgs e)
{
OpenFileDialog op = new OpenFileDialog();
op.InitialDirectory = @"C:\";
op.Title = "Browse Excel Files";
op.CheckFileExists = true;
op.CheckPathExists = true;
op.DefaultExt = "xls";
op.Filter = "Excel Files|*.xls;*.xlsx;*.xlsm;*.csv";
op.FilterIndex = 2;
op.RestoreDirectory = true;
op.ReadOnlyChecked = true;
op.ShowReadOnly = true;
if (op.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
if (File.Exists(op.FileName))
{
string[] Arr = null;
Arr = op.FileName.Split('.');
if (Arr.Length > 0)
{
if (Arr[Arr.Length - 1] == "xls")
sConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" +
op.FileName + ";Extended Properties='Excel 8.0;HDR=Yes;IMEX=1'";
}
else if (Arr[Arr.Length - 1] == "xlsx")
{
sConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + op.FileName + ";Extended Properties='Excel 12.0 Xml;HDR=YES';";
}
}
FillData();
}
}
这也使用以下代码:
public string sConnectionString;
private void FillData()
{
if (sConnectionString.Length > 0)
{
OleDbConnection cn = new OleDbConnection(sConnectionString);
{
cn.Open();
DataTable dt = new DataTable();
OleDbDataAdapter Adpt = new OleDbDataAdapter("select * from [sheet1$]", cn);
Adpt.Fill(dt);
dataGridView1.DataSource = dt;
}
try { }
catch (Exception ex)
{
}
}
}
然后,从ComboBox
选择一个值之后,可以通过单击使用以下代码的updateExcel
按钮,根据需要使用该值更新DataGridView
:
private void updateExcel_Click(object sender, EventArgs e)
{
for (int i = 0; i < dataGridView1.RowCount - 1; i++)
{
dataGridView1[2, i].Value = ConsigneeCombo.Text;
}
}
然后,我要执行的操作是单击“保存”按钮( saveExcel
),并使用来保存加载的文件。 Are you sure you want to save?
Yes
或No
标准Windows对话框。
我尝试使用SaveFileDialogue
( saveFileDialog1
)执行此操作:
private void saveExcel_Click(object sender, EventArgs e)
{
SaveFileDialog saveFileDialog1 = new SaveFileDialog();
saveFileDialog1.InitialDirectory = @"C:\";
saveFileDialog1.Title = "Save Excel File";
saveFileDialog1.DefaultExt = "xls";
saveFileDialog1.Filter = "Excel Files|*.xls;*.xlsx;*.xlsm;*.csv";
saveFileDialog1.FilterIndex = 2;
saveFileDialog1.ShowDialog();
if (saveFileDialog1.FileName != "")
{
System.IO.FileStream fs = (System.IO.FileStream)saveFileDialog1.OpenFile();
fs.Close();
}
}
但这不起作用,因为尝试将文件另存为新文件(具有新的标签名等),并且实际上无法识别文件类型。
我通过使用以下代码解决了这个问题:
private void saveExcel_Click(object sender, EventArgs e)
{
SaveFileDialog sfd = new SaveFileDialog();
sfd.InitialDirectory = @"C:\";
sfd.Title = "Save Excel Files";
sfd.CheckPathExists = true;
sfd.DefaultExt = "xls";
sfd.Filter = "Excel Files|*.xls;*.xlsx;*.xlsm;*.csv";
sfd.FileName = "*.csv";
if (sfd.ShowDialog() == DialogResult.OK)
{
ToCsV(dataGridView1, sfd.FileName);
}
}
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