IronBarCode 无法识别 MSI 条形码

Curtis Chau

已更新:八月 19, 2025

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问题

使用 IronBarCode 库创建 MSI 条形码时，有时BarcodeReader.Read方法无法读取生成的 MSI 条形码，导致扫描结果为空，并且条形码返回预期值。

解决方案

为了确保BarcodeReader.Read可以读取 MSI 条形码，我们必须为Read方法提供辅助可选参数BarcodeReaderOptions 。在BarcodeReaderOptions中，我们通过赋值ExpectedBarcodeTypes来明确指定我们要读取的条形码类型。这样， Read方法就可以识别由 IronBarCode 生成的 MSI 条形码以及任何外部 MSI 条形码。

下面是一个如何将BarcodeReaderOptions应用于BarcodeReader.Read的简单示例。

代码示例

// Creating MSI Barcode with the value "12345"
var myBarcode = BarcodeWriter.CreateBarcode("12345", BarcodeWriterEncoding.MSI);

// Save barcode as image
myBarcode.SaveAsImage("msi.png");

// Reading MSI
var barcodeReaderOptions = new BarcodeReaderOptions
{
     // Assigning BarcodeEncoding.MSI to ExpectBarcodeType to ensure that IronBarcode expects MSI type barcodes specifically 
  ExpectBarcodeTypes = BarcodeEncoding.MSI,
};

// Read barcode with additional barcodeReaderOptions from above
var barcodeResults = BarcodeReader.Read("msi.png", barcodeReaderOptions);

// Using a for loop and print out the result 
foreach (BarcodeResult result in barcodeResults)
{
  Console.WriteLine(result.Text);
    // Output: 12345 
}

// Creating MSI Barcode with the value "12345"
var myBarcode = BarcodeWriter.CreateBarcode("12345", BarcodeWriterEncoding.MSI);

// Save barcode as image
myBarcode.SaveAsImage("msi.png");

// Reading MSI
var barcodeReaderOptions = new BarcodeReaderOptions
{
     // Assigning BarcodeEncoding.MSI to ExpectBarcodeType to ensure that IronBarcode expects MSI type barcodes specifically 
  ExpectBarcodeTypes = BarcodeEncoding.MSI,
};

// Read barcode with additional barcodeReaderOptions from above
var barcodeResults = BarcodeReader.Read("msi.png", barcodeReaderOptions);

// Using a for loop and print out the result 
foreach (BarcodeResult result in barcodeResults)
{
  Console.WriteLine(result.Text);
    // Output: 12345 
}

' Creating MSI Barcode with the value "12345"
Dim myBarcode = BarcodeWriter.CreateBarcode("12345", BarcodeWriterEncoding.MSI)

' Save barcode as image
myBarcode.SaveAsImage("msi.png")

' Reading MSI
Dim barcodeReaderOptions As New BarcodeReaderOptions With {.ExpectBarcodeTypes = BarcodeEncoding.MSI}

' Read barcode with additional barcodeReaderOptions from above
Dim barcodeResults = BarcodeReader.Read("msi.png", barcodeReaderOptions)

' Using a for loop and print out the result 
For Each result As BarcodeResult In barcodeResults
  Console.WriteLine(result.Text)
	' Output: 12345 
Next result

$vbLabelText $csharpLabel

在这个示例中，我们首先实例化一个新的BarcodeReaderOptions变量，然后将ExpectedBarcodeTypes赋值为BarcodeEncoding.MSI枚举，指示 IronBarcode 期望 MSI 条形码。之后，我们在 for 循环中打印出条形码的值，即 12345，因为barcodeResults返回一个BarcodeResults数组，然后遍历每个结果以获取文本值。