Question

在将数据写入word文档模板之前，我必须从Memorystream中删除数据，该数据从一个特定的字符串开始，一直到流的末尾。

我尝试过以下操作，但当我将流转换为字符串时，它会给出一些编码的随机代码。在转换后的字符串中找不到特定的字符串。

        Memorystream ms;
        StreamReader rdr = new StreamReader(ms);
        string st = rdr.ReadToEnd();
        if (st.IndexOf("EmployeeDetail") != -1)
        {
            int start = st.IndexOf("EmployeeDetail");
            string toWrite = st.Substring(0, start);
        }

        var stream = new MemoryStream();
        var writer = new StreamWriter(stream);
        writer.Write(st);
        writer.Flush();
        stream.Position = 0;
        return stream;

Answer 1

这似乎正是您所需要的：

void Main()
{
    var encoding = System.Text.Encoding.Default;

    var inputStream = new MemoryStream();
    inputStream.Write(encoding.GetBytes("Hello, World!"));

    var outputStream = CreateWithReplace(inputStream, ", World", encoding);
    var outputString = encoding.GetString(outputStream.ToArray());
    
    Console.WriteLine(outputString);
}

private MemoryStream CreateWithReplace(MemoryStream inputStream, string textToRemove, System.Text.Encoding encoding)
{
    var outputStream = new MemoryStream();
    inputStream.Position = 0;
    using (StreamReader reader = new StreamReader(inputStream, encoding))
    {
        string inputText = reader.ReadToEnd();
        int start = inputText.IndexOf(textToRemove);
        if (start != -1)
        {
            string outputText = inputText.Substring(0, start);
            using (var writer = new StreamWriter(outputStream, encoding))
            {
                writer.Write(outputText);
                writer.Flush();
            }
        }
        else
        {
            inputStream.WriteTo(outputStream);
        }
    }
    return outputStream;
}

它将Hello输出到控制台。

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