ASP.NET MailMessage.BodyEncoding和MailMessage.SubjectEncoding违约 [英] ASP.NET MailMessage.BodyEncoding and MailMessage.SubjectEncoding defaults

问题描述

简单的问题，但我找不到任何地方MSDN的答案......

Simple question but I can't find the answer anywhere on MSDN...

寻找默认ASP.NET将用于：

Looking for the defaults ASP.NET will use for:

MailMessage.BodyEncoding 和 MailMessage.SubjectEncoding

如果您没有设置它们code？

If you don't set them in code?

感谢

推荐答案

有关<一个href=\"http://msdn.microsoft.com/en-us/library/system.net.mail.mailmessage.bodyencoding.aspx\"><$c$c>MailMessage.BodyEncoding MSDN说：

For MailMessage.BodyEncoding MSDN says:

为指定的值
   BodyEncoding 属性设置
  字符设定的领域
  Content-Type头。默认
  字符集是US-ASCII。

有关 MailMessage.SubjectEncoding 我也无法找到任何记录的默认值，但反射器是救援：

For MailMessage.SubjectEncoding I was also unable to find any documented default value, but reflector is to rescue:

internal void set_Subject(string value)
{
    if ((value != null) && MailBnfHelper.HasCROrLF(value))
    {
        throw new ArgumentException(SR.GetString("MailSubjectInvalidFormat"));
    }
    this.subject = value;
    if (((this.subject != null) && (this.subjectEncoding == null)) && 
         !MimeBasePart.IsAscii(this.subject, false))
    {
        this.subjectEncoding = Encoding.GetEncoding("utf-8");
    }
}

MimeBasePart.IsAscii 是试图确定传递的值是否在 ASCII 编码的内部方法：

MimeBasePart.IsAscii is an internal method which tries to determine whether the passed value is in ASCII encoding:

internal static bool IsAscii(string value, bool permitCROrLF)
{
    if (value == null)
    {
        throw new ArgumentNullException("value");
    }
    foreach (char ch in value)
    {
        if (ch > '\x007f')
        {
            return false;
        }
        if (!permitCROrLF && ((ch == '\r') || (ch == '\n')))
        {
            return false;
        }
    }
    return true;
}

因此​​，似乎为主题的默认编码将 UTF-8 在大多数情况下。

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