C#无法将欧元符号打印到文件中(使用Excel打开时)

Question

我有一个get方法进入web api控制器的问题.此方法返回一个HttpResponseMessage对象,该对象具有带有csv文件的HttpContent,该文件包含欧元符号.当方法返回文件时,不会打印欧元符号.该方法的代码如下:

string export = ... //string with fields separed by ';' and with euro symbol
HttpResponseMessage response = new HttpResponseMessage();
UTF8Encoding encoding = new UTF8Encoding();
Byte[] buffer = encoding.GetBytes(export);
response.Content = new ByteArrayContent(buffer);
response.Content.Headers.ContentType = new MediaTypeHeaderValue("text/csv");
response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment") { FileName = "Export.csv" };
response.Content.Headers.ContentLength = export.Length;
response.Content.Headers.Expires = new DateTimeOffset(DateTime.Now.AddDays(1));
return response;

当我打开文件时,欧元符号无法正确显示.你能给我一个答案吗？

非常感谢.

Answer 1

如上所述,这在Excel中不起作用,因为€符号没有正确显示(尽管它在任何纯文本编辑器中).

[HttpPost("csv")]
public HttpResponseMessage GetCvsReport()
{
    var response = new HttpResponseMessage(HttpStatusCode.OK);
    var content = "12€;3;test";
    var encoding = Encoding.UTF8;

    response.Content = new StringContent(content, encoding , "text/csv");
    response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
    {
        FileName = yourfile.csv"
    };

    return response;
}

我发现以下解决方案似乎正常工作.

使用Windows-1252编码

似乎通过使用Windows-1252编码Excel能够正确解释€符号.

[HttpPost("csv")]
public HttpResponseMessage GetCvsReport()
{
    var response = new HttpResponseMessage(HttpStatusCode.OK);

    var content = "12€;3;test";
    var encoding = Encoding.GetEncoding("Windows-1252");

    response.Content = new StringContent(content, encoding , "text/csv");
    ...
}

前置BOM(字节顺序标记)

另一个有效的解决方案是附加正确的BOM,如下所示:

[HttpPost("csv")]
public HttpResponseMessage GetCvsReport()
{
    var response = new HttpResponseMessage(HttpStatusCode.OK);
    var content = "12€;3;test";
    var encoding = Encoding.UTF8;
    content = encoding.GetString(new byte[] { 0xEF, 0xBB, 0xBF }) + content;    

    response.Content = new StringContent(content, encoding , "text/csv");
    response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
    {
        FileName = yourfile.csv"
    };

    return response;
}

采取您最喜欢的解决方案.