另一个解决方案:

public static MemoryStream GenerateStreamFromString(string value)
{
    return new MemoryStream(Encoding.UTF8.GetBytes(value ?? ""));
}

public Stream GenerateStreamFromString(string s)
{
    return new MemoryStream(Encoding.UTF8.GetBytes(s));
}

String扩展的良好组合:

public static byte[] GetBytes(this string str)
{
    byte[] bytes = new byte[str.Length * sizeof(char)];
    System.Buffer.BlockCopy(str.ToCharArray(), 0, bytes, 0, bytes.Length);
    return bytes;
}

public static Stream ToStream(this string str)
{
    Stream StringStream = new MemoryStream();
    StringStream.Read(str.GetBytes(), 0, str.Length);
    return StringStream;
}

给你:

private Stream GenerateStreamFromString(String p)
{
    Byte[] bytes = UTF8Encoding.GetBytes(p);
    MemoryStream strm = new MemoryStream();
    strm.Write(bytes, 0, bytes.Length);
    return strm;
}

ToStream扩展方法的现代化和轻微修改版本:

public static Stream ToStream(this string value) => ToStream(value, Encoding.UTF8);

public static Stream ToStream(this string value, Encoding encoding) 
                          => new MemoryStream(encoding.GetBytes(value ?? string.Empty));

修改建议在@Palec的评论@肖恩鲍威的回答。

或者作为一行语句(由@satnhak建议):

public static Stream ToStream(this string value, Encoding encoding = null) 
    => new MemoryStream((encoding ?? Encoding.UTF8).GetBytes(value ?? string.Empty));

使用MemoryStream类，调用Encoding。GetBytes首先将字符串转换为字节数组。

您随后是否需要流上的TextReader ?如果是这样，您可以直接提供一个StringReader，并绕过MemoryStream和Encoding步骤。