如何允许用户使用对话框 C# 选择保存位置而不是文件名

Question

我制作了一个税务计算器（所有的理论都是为了实践），它有一个功能，用户可以按一个按钮来导出基本的 PDF 税务报告。根据是雇员还是承包商，对税务报告的要求略有不同。承包商的 EmployeeID 以 "C" 开头。 目前一切顺利。

现在我只要求承包商 承包商 PDF 以特定名称 "ContractorTax" 保存。 有没有一种方法可以让用户 select 在锁定文件名（我猜是文件扩展名）的情况下只允许一个位置的安全文件对话框。

这是我目前拥有的相关代码：

   //Creates PDF.
        private void CreatePdf()
        {           
            //sets default options for save file
            saveFileDialog1.FileName = "Tax Report for " + txtFirstName.Text + " " + txtSurname.Text;
            saveFileDialog1.Filter = "PDF files (*.pdf)|*.pdf|All files (*.*)|*.*";
            saveFileDialog1.DefaultExt = "pdf";
            saveFileDialog1.ShowDialog();

            /*- create FileStream object (fs) with pdf name, mode type, access type, and if it can be shared 
              - create new document object (A4 page size)
              - create a iTextSharp.text.pdf.PdfWriter object, it helps to write the Document to the Specified
                FileStream 
              - open document
              - add paragraph
              - close document*/

            if (txtEmployeeID.Text.ToUpper().StartsWith("C"))
            {
                FileStream fs = new FileStream(saveFileDialog1.FileName, FileMode.Create, FileAccess.Write, FileShare.None);
                Document doc = new Document(PageSize.A4);
                PdfWriter writer = PdfWriter.GetInstance(doc, fs);
                doc.Open();

                doc.Add(new Paragraph("TAX REPORT" + nl + nl + "Employee ID: " + txtEmployeeID.Text.ToUpper() + nl + "Name: " + txtFirstName.Text + " " + txtSurname.Text + nl + "Mobile Number: " + txtMobileNumber.Text + nl +
                        "Email: " + txtEmail.Text + nl + "Department: " + comboBoxDepartment.Text + nl + "Salary: $" + salary.ToString() + nl + "Tax Payable: $" + taxPayable.ToString()));
                doc.Close();

            }
            else
            {
                FileStream fs = new FileStream(saveFileDialog1.FileName, FileMode.Create, FileAccess.Write, FileShare.None);
                Document doc = new Document(PageSize.A4);
                PdfWriter writer = PdfWriter.GetInstance(doc, fs);
                doc.Open();

                doc.Add(new Paragraph("TAX REPORT" + nl + nl + "Employee ID: " + txtEmployeeID.Text.ToUpper() + nl + "Name: " + txtFirstName.Text + " " + txtSurname.Text + nl + "Mobile Number: " + txtMobileNumber.Text + nl +
                        "Department: " + comboBoxDepartment.Text + nl + "Salary: $" + salary.ToString() + nl + "Tax Payable: $" + taxPayable.ToString()));
                doc.Close();
            }



        }

我发现之前有人问过这个问题，但答案仅与 Java 相关，我使用的是 visual studio 2017 并使用 C# 进行编码。

Answer 1

对于您的问题，您希望雇主的税收收据名称是指定的且不能更改。

您可以尝试通过以下代码获取。

private void CreatePdf()
    {         
        string path1 = "ContractorTax.pdf";
        if (txtEmployeeID.Text.ToUpper().StartsWith("C")) 
        {

            FolderBrowserDialog dialog = new FolderBrowserDialog();
            dialog.ShowDialog();
            string path2 = Path.Combine(dialog.SelectedPath, path1);
            FileStream fs = new FileStream(path2, FileMode.Create, FileAccess.Write, FileShare.None);
            Document doc = new Document(PageSize.A4);
            PdfWriter writer = PdfWriter.GetInstance(doc, fs);
            doc.Open();

            doc.Add(new Paragraph("TAX REPORT" + nl + nl + "Employee ID: " + txtEmployeeID.Text.ToUpper() + nl + "Name: " + txtFirstName.Text + " " + txtSurname.Text + nl + "Mobile Number: " + txtMobileNumber.Text + nl +
                    "Email: " + txtEmail.Text + nl + "Department: " + comboBoxDepartment.Text + nl + "Salary: $" + salary.ToString() + nl + "Tax Payable: $" + taxPayable.ToString()));
            doc.Close();         
            MessageBox.Show("success");
        }
        else
        {
            saveFileDialog1.FileName = "Tax Report for " + txtFirstName.Text + " " + txtSurname.Text;
            saveFileDialog1.Filter = "PDF files (*.pdf)|*.pdf|All files (*.*)|*.*";
            saveFileDialog1.DefaultExt = "pdf";
            saveFileDialog1.ShowDialog();

            FileStream fs = new FileStream(saveFileDialog1.FileName, FileMode.Create, FileAccess.Write, FileShare.None);
            Document doc = new Document(PageSize.A4);
            PdfWriter writer = PdfWriter.GetInstance(doc, fs);
            doc.Open();

            doc.Add(new Paragraph("TAX REPORT" + nl + nl + "Employee ID: " + txtEmployeeID.Text.ToUpper() + nl + "Name: " + txtFirstName.Text + " " + txtSurname.Text + nl + "Mobile Number: " + txtMobileNumber.Text + nl +
                    "Department: " + comboBoxDepartment.Text + nl + "Salary: $" + salary.ToString() + nl + "Tax Payable: $" + taxPayable.ToString()));
            doc.Close();
        }



    }

希望对您有所帮助。

Answer 2

让我们简单点。
通常您希望用户 select 文件夹，而不是文件位置。
所以你应该使用 FolderBrowserDialog 而不是 OpenFileDialog。得到文件夹后，用Path.Combine把文件名和文件夹名组合成一个完整的路径

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