asp.net 解决下载文件–中文名乱码问题

最近的项目中需要导出Excel 表格，Excel名称是中文的，在IE中下载老是出现中文名称乱码问题，设置 Respone Encoding 无果，最后找到解决方案如下：

public static string ToHexString(string s)

{

char[] chars = s.ToCharArray();

StringBuilder builder = new StringBuilder();

for (int index = 0; index < chars.Length; index++)

{

bool needToEncode = NeedToEncode(chars[index]);

if (needToEncode)

{

string encodedString = ToHexString(chars[index]);

builder.Append(encodedString);

}

else

{

builder.Append(chars[index]);

}

}

return builder.ToString();

}

/// <summary>

/// Determines if the character needs to be encoded.

/// </summary>

/// <param name="chr"></param>

/// <returns></returns>

private static bool NeedToEncode(char chr)

{

string reservedChars = "$-_.+!*'(),@=&";

if (chr > 127)

return true;

if (char.IsLetterOrDigit(chr) || reservedChars.IndexOf(chr) >= 0)

return false;

return true;

}

/// <summary>

/// Encodes a non-US-ASCII character.

/// </summary>

/// <param name="chr"></param>

/// <returns></returns>

private static string ToHexString(char chr)

{

UTF8Encoding utf8 = new UTF8Encoding();

byte[] encodedBytes = utf8.GetBytes(chr.ToString());

StringBuilder builder = new StringBuilder();

for (int index = 0; index < encodedBytes.Length; index++)

{

builder.AppendFormat("%{0}", Convert.ToString(encodedBytes[index], 16));

}

return builder.ToString();

}

使用时，只需调用：

string downloadName = ToHexString(“中文名称”);