需求：

• Barcode Professional for ASP.NET v3.0以上
• Microsoft .NET 框架（所有版本）

由于條件的限制，條碼顯示位置有限，那么就需要懂得規定的區域內顯示條碼方法。今天將給大家簡單介紹如何在規定區域內顯示條碼。

【Barcode Professional for ASP.NET下載】

我們知道在Barcode Professional有GetBarcodeImage()方法，而這種方法可以通過barsAreaSizeInInches參數實現規定區域內條碼的顯示。現在我們需注意以下三點：

• 規定區域的尺寸位置（條碼寬和高）
• 規定目標區域的寬（包括條碼加上左右Quiet Zones 區域的寬）
• 規定目標區域的高（條碼欄高度）

假定：編碼的數據是1234567890，使用128代碼，以300DPI呈現，可供條碼顯示的位置面積是1*0.5英寸.

參考代碼：

VB

Private Sub SaveBarcode()
'Create a Barcode Professional object
Dim bcp As New Neodynamic.WebControls.BarcodeProfessional.BarcodeProfessional()
'Set the barcode symbology to Code 128
bcp.Symbology = Neodynamic.WebControls.BarcodeProfessional.Symbology.Code128
'Set the value to encode
bcp.Code = "1234567890"
'Barcode dimensions settings
bcp.BarHeight = 1.0F
bcp.BarWidth = 0.01F
'Resolution
Dim dpi As Single = 300.0F
'Target size in inches
Dim targetArea As New System.Drawing.SizeF(1.0F, 0.5F)
'Get the barcode image fitting the target area
Dim imgBarcode As System.Drawing.Image = bcp.GetBarcodeImage(dpi, targetArea)
'Save it on disk in PNG format
imgBarcode.Save("C:\temp\barcode128.png", System.Drawing.Imaging.ImageFormat.Png)
imgBarcode.Dispose()
End Sub

C#

private void SaveBarcode()
{
//Create a Barcode Professional object
Neodynamic.WebControls.BarcodeProfessional.BarcodeProfessional bcp = new Neodynamic.WebControls.BarcodeProfessional.BarcodeProfessional();
//Set the barcode symbology to Code 128
bcp.Symbology = Neodynamic.WebControls.BarcodeProfessional.Symbology.Code128;
//Set the value to encode
bcp.Code = "1234567890";
//Barcode dimensions settings
bcp.BarHeight = 1.0f;
bcp.BarWidth = 0.01f;
//Resolution
float dpi = 300.0f;
//Target size in inches
System.Drawing.SizeF targetArea = new System.Drawing.SizeF(1.0f, 0.5f);
//Get the barcode image fitting the target area
System.Drawing.Image imgBarcode = bcp.GetBarcodeImage(dpi, targetArea);
//Save it on disk in PNG format
imgBarcode.Save(@"C:\temp\barcode128.png", System.Drawing.Imaging.ImageFormat.Png);
imgBarcode.Dispose();
}

需要注意的是目標寬度是整個條碼欄寬度加上左右兩邊的Quiet Zones (QuietZoneWidth屬性 )，然而目標區域高度僅僅只是條碼欄的高度，可參考下圖（前面代碼生成）。

如果只想條碼布滿整個目標區域，需要將QuietZoneWidth屬性設置為0（即除去左右兩邊的邊距）DisplayCode屬性設置為False（即隱藏可讀文本），可參考下列代碼

VB

Private Sub SaveBarcode()
'Create a Barcode Professional object
Dim bcp As New Neodynamic.WebControls.BarcodeProfessional.BarcodeProfessional()
'Set the barcode symbology to Code 128
bcp.Symbology = Neodynamic.WebControls.BarcodeProfessional.Symbology.Code128
'Set the value to encode
bcp.Code = "1234567890"
'Barcode dimensions settings
bcp.BarHeight = 1.0F
bcp.BarWidth = 0.01F
bcp.QuietZoneWidth = 0
bcp.DisplayCode = False
'Resolution
Dim dpi As Single = 300.0F
'Target size in inches
Dim targetArea As New System.Drawing.SizeF(1.0F, 0.5F)
'Get the barcode image fitting the target area
Dim imgBarcode As System.Drawing.Image = bcp.GetBarcodeImage(dpi, targetArea)
'Save it on disk in PNG format
imgBarcode.Save("C:\temp\barcode128_full.png", System.Drawing.Imaging.ImageFormat.Png)
imgBarcode.Dispose()
End Sub

C#

private void SaveBarcode()
{
//Create a Barcode Professional object
Neodynamic.WebControls.BarcodeProfessional.BarcodeProfessional bcp = new Neodynamic.WebControls.BarcodeProfessional.BarcodeProfessional();
//Set the barcode symbology to Code 128
bcp.Symbology = Neodynamic.WebControls.BarcodeProfessional.Symbology.Code128;
//Set the value to encode
bcp.Code = "1234567890";
//Barcode dimensions settings
bcp.BarHeight = 1.0f;
bcp.BarWidth = 0.01f;
bcp.QuietZoneWidth = 0;
bcp.DisplayCode = false;
//Resolution
float dpi = 300.0f;
//Target size in inches
SizeF targetArea = new System.Drawing.SizeF(1.0f, 0.5f);
//Get the barcode image fitting the target area
System.Drawing.Image imgBarcode = bcp.GetBarcodeImage(dpi, targetArea);
//Save it on disk in PNG format
imgBarcode.Save(@"C:\temp\barcode128_full.png", System.Drawing.Imaging.ImageFormat.Png);
imgBarcode.Dispose();
}