用于显示“文件正在使用或打开”的例外情况 [英] Which exception to use to show "file is in use or open"
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问题描述
您好。
我有两个导出按钮。我想为这些按钮编写例外，这些按钮将向用户显示正在使用或由其他应用程序打开的消息。请帮帮我。
Hello.
I have two export buttons. I want to write exceptions for these buttons that will show a message to user that File is in use or opened by another application. Please help me.
private void pDFExportToolStripMenuItem_Click(object sender, EventArgs e)
{
if (dataGridView1.RowCount == 0)
{
DialogResult result = MessageBox.Show("Table is empty, Export to PDF is impossible", "Export to PDF", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
else
{
//Creating iTextSharp Table from the DataTable data
PdfPTable pdfTable = new PdfPTable(dataGridView1.ColumnCount);
pdfTable.DefaultCell.Padding = 3;
pdfTable.SetWidths(new int[6] { 35, 90, 70, 70, 70, 90 });
pdfTable.TotalWidth = 425;
pdfTable.LockedWidth = true;
pdfTable.HorizontalAlignment = Element.ALIGN_LEFT;
//pdfTable.DefaultCell.BorderWidth = 1;
//Adding Header row
foreach (DataGridViewColumn column in dataGridView1.Columns)
{
PdfPCell cell = new PdfPCell(new Phrase(column.HeaderText));
cell.BackgroundColor = new iTextSharp.text.Color(188, 222, 248);
cell.FixedHeight = 18;
pdfTable.AddCell(cell);
}
//Adding DataRow
foreach (DataGridViewRow row in dataGridView1.Rows)
{
foreach (DataGridViewCell celli in row.Cells)
{
try
{
pdfTable.AddCell(celli.Value.ToString());
}
catch { }
}
}
SaveFileDialog sfd = new SaveFileDialog();
sfd.Filter = "PDF File |*.pdf";
sfd.Title = "PDF kimi saxlamaq";
if (sfd.ShowDialog() == DialogResult.OK)
{
try
{
Document pdfDoc = new Document(PageSize.A4, 85f, 10f, 28f, 20f);
PdfWriter wri = PdfWriter.GetInstance(pdfDoc, new FileStream(sfd.FileName, FileMode.Create));
pdfDoc.Open();
Paragraph paragraph = new Paragraph("Kreditin ödəmə planı", h);
paragraph.Alignment = Element.ALIGN_LEFT;
pdfDoc.Add(paragraph);
pdfDoc.Add(new Paragraph(" "));
pdfDoc.Add(pdfTable);
pdfDoc.Close();
MessageBox.Show("Table has been exported to PDF.", "Export to PDF", MessageBoxButtons.OK, MessageBoxIcon.Information);
System.Diagnostics.Process.Start(Path.GetFullPath(sfd.FileName));
}
catch
{
MessageBox.Show("Table not exported to PDF. Because" + " " + Path.GetFullPath(sfd.FileName) + " " + "is in use", "Warning", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
}
}
}
private void excelExportToolStripMenuItem_Click(object sender, EventArgs e)
{
if (dataGridView1.RowCount == 0)
{
DialogResult result = MessageBox.Show("Table is empty, Export to Excel is impossible", "Export to Excel", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
else
{
saveFileDialog1.Title = "Save as Excel";
saveFileDialog1.FileName = "";
saveFileDialog1.Filter = "Excel Workbook|*.xlsx|Excel (97-2003) Workbook|*.xls";
if (saveFileDialog1.ShowDialog() == DialogResult.OK)
{
try
{
//Creae an Excel application instance
Excel.Application ExcelApp = new Excel.Application();
ExcelApp.Application.Workbooks.Add(Type.Missing);
//Change properties of the Workbook
ExcelApp.Columns.ColumnWidth = 13;
ExcelApp.Columns[1].ColumnWidth = 5;
ExcelApp.get_Range("A1", "A1").Font.Size = 18;
//ExcelApp.Rows[13, 5].Interior.Color = Excel.XlRgbColor.rgbLightSkyBlue;
Excel.Range chartRange;
chartRange = ExcelApp.get_Range("A13", "F13");
chartRange.Interior.Color = Excel.XlRgbColor.rgbLightSkyBlue;
//ExcelApp.Rows[13].Font.Size = 12;
ExcelApp.Cells[13, 1].EntireRow.Font.Bold = true;
ExcelApp.Cells.HorizontalAlignment = Microsoft.Office.Interop.Excel.XlHAlign.xlHAlignLeft;
ExcelApp.Cells[1, "A"] = "Kreditin ödəmə planı";
ExcelApp.Cells[2, "A"] = "";
ExcelApp.Cells[3, "A"] = "Ödəniş metodu:" + " " + comboBox3.Text;
ExcelApp.Cells[4, "A"] = "Kreditin məbləği:" + " " + kreditmeblegi.ToString() + " " + comboBox1.Text;
ExcelApp.Cells[5, "A"] = "Faiz dərəcəsi:" + " " + illikfaiz.ToString() + "% illik";
ExcelApp.Cells[6, "A"] = "Kreditin müddəti:" + " " + Convert.ToDouble(textBox3.Text) + " " + comboBox2.Text;
ExcelApp.Cells[7, "A"] = "Verilmə tarixi:" + " " + dateTimePicker1.Text;
ExcelApp.Cells[8, "A"] = "";
ExcelApp.Cells[9, "A"] = "Aylıq ödəniş:" + " " + label9.Text;
ExcelApp.Cells[10, "A"] = "Cəmi məbləğ:" + " " + umumiodenis.ToString("N2") + " " + comboBox1.Text;
ExcelApp.Cells[11, "A"] = "Ödənilən faiz:" + " " + odenilenfaiz.ToString("N2") + " " + comboBox1.Text;
// Storing header part in Excel
for (int i = 1; i < dataGridView1.Columns.Count + 1; i++)
{
ExcelApp.Cells[13, i] = dataGridView1.Columns[i - 1].HeaderText;
}
//Storing each row and column value to excel sheet
for (int j = 0; j < dataGridView1.Rows.Count; j++)
{
for (int k = 0; k < dataGridView1.Columns.Count; k++)
{
ExcelApp.Cells[j + 14, k + 1] = dataGridView1.Rows[j].Cells[k].Value.ToString();
}
}
ExcelApp.ActiveWorkbook.SaveCopyAs(saveFileDialog1.FileName.ToString());
ExcelApp.ActiveWorkbook.Saved = true;
ExcelApp.Quit();
MessageBox.Show("Table has been exported to Excel.", "Export to Excel", MessageBoxButtons.OK, MessageBoxIcon.Information);
System.Diagnostics.Process.Start(Path.GetFullPath(saveFileDialog1.FileName));
}
catch
{
MessageBox.Show("Table not exported to PDF. Because" + " " + Path.GetFullPath(saveFileDialog1.FileName) + " " + "is in use.", "Warning", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
}
}
我尝试了什么：
我在第一个按钮中使用了catch（IOException），它工作正常，但同样的异常在第二个按钮中没有用。请清楚地告诉我如何为这些按钮编写例外。
What I have tried:
I used catch (IOException) in first button, it worked, but same exception not worked in the second button. Please show me clearly how to write exceptions for these buttons.
推荐答案
您可以在方法开头调用此方法：
You could call this method at the beginning of your method:
public static string IsFileOpen(string filename)
{
string result = string.Empty;
try
{
if (File.Exists(filename))
{
using (FileStream fs = File.Open(filename, FileMode.Open, FileAccess.Read, FileShare.None))
{
}
}
}
catch(Exception ex)
{
result = ex.Message;
}
return result;
}
喜欢这样：
like so:
string result = IsFileOpen(myFileName)
if (!string.IsNullOrEmpty(result))
{
MessageBox.Show(string.Format("Stupid rabbit, Trix are for kids! Because {0}", result));
}
else
{
...
// your existing code goes here
...
}
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