.NET軟體開發（對開發人員的運作方式）

private void SetupDataGridViewColumns()
{
    invoiceDataGridView.Columns.Clear(); // Clear existing columns if any
    // Now add the rest of your columns
    invoiceDataGridView.Columns.Add("itemIdColumn", "Item ID");
    invoiceDataGridView.Columns.Add("descriptionColumn", "Description");
    invoiceDataGridView.Columns.Add("quantityColumn", "Quantity");
    invoiceDataGridView.Columns.Add("unitPriceColumn", "Unit Price");
    invoiceDataGridView.Columns.Add("totalPriceColumn", "Total Price");
    // Set the Total Price column to read-only as it will be calculated automatically
    invoiceDataGridView.Columns ["totalPriceColumn"].ReadOnly = true;
    // Add a button column for delete action
    DataGridViewButtonColumn deleteButtonColumn = new DataGridViewButtonColumn();
    deleteButtonColumn.HeaderText = "";
    deleteButtonColumn.Name = "deleteButtonColumn";
    deleteButtonColumn.Text = "Delete";
    deleteButtonColumn.UseColumnTextForButtonValue = true; // This will set the button text to "Delete"
    // Add the delete button column to the DataGridView
    invoiceDataGridView.Columns.Add(deleteButtonColumn);
}
public Form1()
{
    InitializeComponent();
    SetupDataGridViewColumns();
    // Wire up the CellClick event to a handler
    invoiceDataGridView.CellClick += invoiceDataGridView_CellClick;
}
private void invoiceDataGridView_CellClick(object sender, DataGridViewCellEventArgs e)
{
    // If the clicked cell is part of the button column and not the header row
    if (e.ColumnIndex == invoiceDataGridView.Columns ["deleteButtonColumn"].Index && e.RowIndex >= 0)
    {
        // Confirm delete operation
        if (MessageBox.Show("Are you sure you want to delete this item?", "Confirm Delete", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
        {
            // Remove the row from the DataGridView
            invoiceDataGridView.Rows.RemoveAt(e.RowIndex);
        }
    }
}

Private Sub SetupDataGridViewColumns()
	invoiceDataGridView.Columns.Clear() ' Clear existing columns if any
	' Now add the rest of your columns
	invoiceDataGridView.Columns.Add("itemIdColumn", "Item ID")
	invoiceDataGridView.Columns.Add("descriptionColumn", "Description")
	invoiceDataGridView.Columns.Add("quantityColumn", "Quantity")
	invoiceDataGridView.Columns.Add("unitPriceColumn", "Unit Price")
	invoiceDataGridView.Columns.Add("totalPriceColumn", "Total Price")
	' Set the Total Price column to read-only as it will be calculated automatically
	invoiceDataGridView.Columns ("totalPriceColumn").ReadOnly = True
	' Add a button column for delete action
	Dim deleteButtonColumn As New DataGridViewButtonColumn()
	deleteButtonColumn.HeaderText = ""
	deleteButtonColumn.Name = "deleteButtonColumn"
	deleteButtonColumn.Text = "Delete"
	deleteButtonColumn.UseColumnTextForButtonValue = True ' This will set the button text to "Delete"
	' Add the delete button column to the DataGridView
	invoiceDataGridView.Columns.Add(deleteButtonColumn)
End Sub
'INSTANT VB WARNING: The following constructor is declared outside of its associated class:
'ORIGINAL LINE: public Form1()
Public Sub New()
	InitializeComponent()
	SetupDataGridViewColumns()
	' Wire up the CellClick event to a handler
	AddHandler invoiceDataGridView.CellClick, AddressOf invoiceDataGridView_CellClick
End Sub
Private Sub invoiceDataGridView_CellClick(ByVal sender As Object, ByVal e As DataGridViewCellEventArgs)
	' If the clicked cell is part of the button column and not the header row
	If e.ColumnIndex = invoiceDataGridView.Columns ("deleteButtonColumn").Index AndAlso e.RowIndex >= 0 Then
		' Confirm delete operation
		If MessageBox.Show("Are you sure you want to delete this item?", "Confirm Delete", MessageBoxButtons.YesNo, MessageBoxIcon.Question) = DialogResult.Yes Then
			' Remove the row from the DataGridView
			invoiceDataGridView.Rows.RemoveAt(e.RowIndex)
		End If
	End If
End Sub

public void AddItemToInvoice(string itemId, string description, int quantity, decimal unitPrice)
{
    decimal totalPrice = quantity * unitPrice;
    invoiceDataGridView.Rows.Add(itemId, description, quantity, unitPrice, totalPrice);
}
 private void CalculateTotalAmount()
 {
     decimal totalAmount = 0m;
     foreach (DataGridViewRow row in invoiceDataGridView.Rows)
     {
         totalAmount += Convert.ToDecimal(row.Cells ["totalPriceColumn"].Value ?? 0);
     }
     lblTotalAmount.Text = $"{totalAmount:C2}"; // Assuming 'lblTotalAmount' is the name of your Label control
 }
private void btnAddItem_Click(object sender, EventArgs e)
{
    // Assuming your text boxes and numeric up/down controls have the following names:
    // txtItemID, txtDescription, txtUnitPrice, and numericUpDownQuantity
    // Collect data from input controls
    string itemId = txtItemID.Text;
    string description = txtDescription.Text;
    int quantity = (int)numericUpDownQuantity.Value;
    decimal unitPrice;
    // Validate the collected data
    // Check if the unit price is a valid decimal
    bool isUnitPriceValid = decimal.TryParse(txtUnitPrice.Text, out unitPrice);
    // Additional validation can be implemented as needed
    if (string.IsNullOrEmpty(itemId) 
 string.IsNullOrEmpty(description) 
 quantity <= 0 
 !isUnitPriceValid 
 unitPrice <= 0)
    {
        MessageBox.Show("Please enter valid data for all fields.", "Invalid Data", MessageBoxButtons.OK, MessageBoxIcon.Warning);
        return;
    }
    // Add data to the DataGridView
    AddItemToInvoice(itemId, description, quantity, unitPrice);
    // Optionally, clear the input fields after adding the item to the grid
    txtItemID.Clear();
    txtDescription.Clear();
    txtUnitPrice.Clear();
    numericUpDownQuantity.Value = 0; // or numericUpDownQuantity.Minimum if 0 is not allowed
    CalculateTotalAmount();
}

IRON VB CONVERTER ERROR developers@ironsoftware.com

private void btnInvoice_Click(object sender, EventArgs e)
        {
            IronPdf.License.LicenseKey = "License-Key";
            // Collect customer information
            var customerName = txtName.Text; // Adjusted to your actual TextBox names
            var customerEmail = txtEmail.Text;
            var customerAddress = txtAddress.Text;
            var customerPhone = txtPhone.Text;
            // Start building the HTML content for the invoice
            var htmlStringBuilder = new StringBuilder();
            htmlStringBuilder.Append("<html>");
            htmlStringBuilder.Append("<head>");
            htmlStringBuilder.Append("<title>Invoice</title>");
            // Add some basic CSS styles for the invoice
            htmlStringBuilder.Append(@"
    <style>
        body {
            font-family: 'Arial', sans-serif;
        }
        h1 {
            color: #333;
            text-align: center;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            margin-top: 20px;
        }
        th, td {
            border: 1px solid #999;
            padding: 8px;
            text-align: left;
        }
        th {
            background-color: #f2f2f2;
        }
        tr:nth-child(even) {
            background-color: #f9f9f9;
        }
        h2 {
            text-align: right;
            margin-top: 20px;
        }
.customer-info {
        font-family: 'Helvetica', 'Arial', sans-serif;
        line-height: 1.6;
        margin-bottom: 20px;
    }
    .customer-info p {
        margin: 0 0 10px 0;
        color: #333;
    }
    .customer-info label {
        font-weight: bold;
    }
    </style>");
            // You can add style tags here for styling your PDF content
            htmlStringBuilder.Append("</head>");
            htmlStringBuilder.Append("<body>");
            htmlStringBuilder.Append("<h1>Invoice</h1>");
            htmlStringBuilder.Append("<div class='customer-info'>");
            htmlStringBuilder.Append($"<p><strong>Customer Name:</strong> {customerName}</p>");
            htmlStringBuilder.Append($"<p><strong>Customer Email:</strong> {customerEmail}</p>");
            htmlStringBuilder.Append($"<p><strong>Customer Address:</strong> {customerAddress}</p>");
            htmlStringBuilder.Append($"<p><strong>Customer Phone:</strong> {customerPhone}</p>");
            htmlStringBuilder.Append("</div>");
            // Add the invoice items
            htmlStringBuilder.Append("<table border='1'><tr><th>Item ID</th><th>Description</th><th>Quantity</th><th>Unit Price</th><th>Total Price</th></tr>");
            foreach (DataGridViewRow row in invoiceDataGridView.Rows)
            {
                if (row.IsNewRow) continue; // Skip the new row placeholder
                htmlStringBuilder.Append("<tr>");
                htmlStringBuilder.Append($"<td>{row.Cells ["itemIdColumn"].Value}</td>");
                htmlStringBuilder.Append($"<td>{row.Cells ["descriptionColumn"].Value}</td>");
                htmlStringBuilder.Append($"<td>{row.Cells ["quantityColumn"].Value}</td>");
                htmlStringBuilder.Append($"<td>{row.Cells ["unitPriceColumn"].Value:C2}</td>");
                htmlStringBuilder.Append($"<td>{row.Cells ["totalPriceColumn"].Value:C2}</td>");
                htmlStringBuilder.Append("</tr>");
            }
            htmlStringBuilder.Append("</table>");
            // Add the total amount
            htmlStringBuilder.Append($"<h2>Total Amount: {lblTotalAmount.Text}</h2>");
            // Close the HTML string
            htmlStringBuilder.Append("</body></html>");
            // Use IronPDF to convert the HTML string to a PDF document
            var renderer = new IronPdf.ChromePdfRenderer();
            var pdfDocument = renderer.RenderHtmlAsPdf(htmlStringBuilder.ToString());
            // Save the PDF to a file
            string savePath = Path.Combine($"F:\\Invoice_{DateTime.Now:yyyyMMddHHmmss}.pdf"); // to avoid file name conflicts and save to desktop
            pdfDocument.SaveAs(savePath);
            // Show a success dialog
            MessageBox.Show("The invoice has been successfully saved to your desktop.", "Invoice Saved", MessageBoxButtons.OK, MessageBoxIcon.Information);
        }

Private Sub btnInvoice_Click(ByVal sender As Object, ByVal e As EventArgs)
			IronPdf.License.LicenseKey = "License-Key"
			' Collect customer information
			Dim customerName = txtName.Text ' Adjusted to your actual TextBox names
			Dim customerEmail = txtEmail.Text
			Dim customerAddress = txtAddress.Text
			Dim customerPhone = txtPhone.Text
			' Start building the HTML content for the invoice
			Dim htmlStringBuilder = New StringBuilder()
			htmlStringBuilder.Append("<html>")
			htmlStringBuilder.Append("<head>")
			htmlStringBuilder.Append("<title>Invoice</title>")
			' Add some basic CSS styles for the invoice
			htmlStringBuilder.Append("
    <style>
        body {
            font-family: 'Arial', sans-serif;
        }
        h1 {
            color: #333;
            text-align: center;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            margin-top: 20px;
        }
        th, td {
            border: 1px solid #999;
            padding: 8px;
            text-align: left;
        }
        th {
            background-color: #f2f2f2;
        }
        tr:nth-child(even) {
            background-color: #f9f9f9;
        }
        h2 {
            text-align: right;
            margin-top: 20px;
        }
.customer-info {
        font-family: 'Helvetica', 'Arial', sans-serif;
        line-height: 1.6;
        margin-bottom: 20px;
    }
    .customer-info p {
        margin: 0 0 10px 0;
        color: #333;
    }
    .customer-info label {
        font-weight: bold;
    }
    </style>")
			' You can add style tags here for styling your PDF content
			htmlStringBuilder.Append("</head>")
			htmlStringBuilder.Append("<body>")
			htmlStringBuilder.Append("<h1>Invoice</h1>")
			htmlStringBuilder.Append("<div class='customer-info'>")
			htmlStringBuilder.Append($"<p><strong>Customer Name:</strong> {customerName}</p>")
			htmlStringBuilder.Append($"<p><strong>Customer Email:</strong> {customerEmail}</p>")
			htmlStringBuilder.Append($"<p><strong>Customer Address:</strong> {customerAddress}</p>")
			htmlStringBuilder.Append($"<p><strong>Customer Phone:</strong> {customerPhone}</p>")
			htmlStringBuilder.Append("</div>")
			' Add the invoice items
			htmlStringBuilder.Append("<table border='1'><tr><th>Item ID</th><th>Description</th><th>Quantity</th><th>Unit Price</th><th>Total Price</th></tr>")
			For Each row As DataGridViewRow In invoiceDataGridView.Rows
				If row.IsNewRow Then
					Continue For ' Skip the new row placeholder
				End If
				htmlStringBuilder.Append("<tr>")
				htmlStringBuilder.Append($"<td>{row.Cells ("itemIdColumn").Value}</td>")
				htmlStringBuilder.Append($"<td>{row.Cells ("descriptionColumn").Value}</td>")
				htmlStringBuilder.Append($"<td>{row.Cells ("quantityColumn").Value}</td>")
				htmlStringBuilder.Append($"<td>{row.Cells ("unitPriceColumn").Value:C2}</td>")
				htmlStringBuilder.Append($"<td>{row.Cells ("totalPriceColumn").Value:C2}</td>")
				htmlStringBuilder.Append("</tr>")
			Next row
			htmlStringBuilder.Append("</table>")
			' Add the total amount
			htmlStringBuilder.Append($"<h2>Total Amount: {lblTotalAmount.Text}</h2>")
			' Close the HTML string
			htmlStringBuilder.Append("</body></html>")
			' Use IronPDF to convert the HTML string to a PDF document
			Dim renderer = New IronPdf.ChromePdfRenderer()
			Dim pdfDocument = renderer.RenderHtmlAsPdf(htmlStringBuilder.ToString())
			' Save the PDF to a file
			Dim savePath As String = Path.Combine($"F:\Invoice_{DateTime.Now:yyyyMMddHHmmss}.pdf") ' to avoid file name conflicts and save to desktop
			pdfDocument.SaveAs(savePath)
			' Show a success dialog
			MessageBox.Show("The invoice has been successfully saved to your desktop.", "Invoice Saved", MessageBoxButtons.OK, MessageBoxIcon.Information)
End Sub