编写没有字节顺序标记 (BOM) 的文本文件? [英] Write text files without Byte Order Mark (BOM)?

问题描述

我正在尝试使用 VB.Net 和 UTF8 编码创建一个文本文件，没有 BOM.任何人都可以帮助我，如何做到这一点?
我可以用 UTF8 编码写入文件，但是，如何从中删除字节顺序标记?

I am trying to create a text file using VB.Net with UTF8 encoding, without BOM. Can anybody help me, how to do this?
I can write file with UTF8 encoding but, how to remove Byte Order Mark from it?

我试过这样的代码；

    Dim utf8 As New UTF8Encoding()
    Dim utf8EmitBOM As New UTF8Encoding(True)
    Dim strW As New StreamWriter("c:	empom1.html", True, utf8EmitBOM)
    strW.Write(utf8EmitBOM.GetPreamble())
    strW.WriteLine("hi there")
    strW.Close()

        Dim strw2 As New StreamWriter("c:	empom2.html", True, utf8)
        strw2.Write(utf8.GetPreamble())
        strw2.WriteLine("hi there")
        strw2.Close()

1.html 仅使用 UTF8 编码创建，2.html 使用 ANSI 编码格式创建.

1.html get created with UTF8 encoding only and 2.html get created with ANSI encoding format.

简化方法 - http://whatilearnttuday.blogspot.com/2011/10/write-text-files-without-byte-order.html

推荐答案

为了省略字节顺序标记 (BOM)，您的流必须使用 UTF8Encoding 除了 System.Text.Encoding.UTF8(配置为生成 BOM).有两种简单的方法可以做到这一点:

In order to omit the byte order mark (BOM), your stream must use an instance of UTF8Encoding other than System.Text.Encoding.UTF8 (which is configured to generate a BOM). There are two easy ways to do this:

1.明确指定合适的编码:

1. 调用UTF8Encoding 构造函数，带有 False 用于 encoderShouldEmitUTF8Identifier 参数.

1. Call the UTF8Encoding constructor with False for the encoderShouldEmitUTF8Identifier parameter.

将 UTF8Encoding 实例传递给流构造函数.

Pass the UTF8Encoding instance to the stream constructor.

' VB.NET:
Dim utf8WithoutBom As New System.Text.UTF8Encoding(False)
Using sink As New StreamWriter("Foobar.txt", False, utf8WithoutBom)
    sink.WriteLine("...")
End Using

// C#:
var utf8WithoutBom = new System.Text.UTF8Encoding(false);
using (var sink = new StreamWriter("Foobar.txt", false, utf8WithoutBom))
{
    sink.WriteLine("...");
}

2.使用默认编码:

如果您根本不向 StreamWriter 的构造函数提供 Encoding，StreamWriter 将默认使用没有 BOM 的 UTF8 编码，所以以下应该也能正常工作:

If you do not supply an Encoding to StreamWriter's constructor at all, StreamWriter will by default use an UTF8 encoding without BOM, so the following should work just as well:

' VB.NET:
Using sink As New StreamWriter("Foobar.txt")
    sink.WriteLine("...")
End Using

// C#:
using (var sink = new StreamWriter("Foobar.txt"))
{
    sink.WriteLine("...");
}

最后，请注意省略 BOM 仅适用于 UTF-8，不适用于 UTF-16.

Finally, note that omitting the BOM is only permissible for UTF-8, not for UTF-16.

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