string如何写入MemoryStream，MemoryStream如何转成byte[]

Question

１。string如何写入MemoryStream
２。MemoryStream如何转成byte[]

Answer 1

MemoryStream ms = new ...
String str =. ..
byte[] bstr = Encodeing.Default.GetBytes(str);
ms.Write(bstr);byte[] bstr = ms.ToArray();

Answer 2

using System;
using System.IO;
using System.Text;class MemStream
{
    static void Main()
    {
        int count;
        byte[] byteArray;
        char[] charArray;
        UnicodeEncoding uniEncoding = new UnicodeEncoding();        // Create the data to write to the stream.
        byte[] firstString = uniEncoding.GetBytes(
            "Invalid file path characters are: ");
        byte[] secondString = uniEncoding.GetBytes(
            Path.InvalidPathChars);        using(MemoryStream memStream = new MemoryStream(100))
        {
            // Write the first string to the stream.
            memStream.Write(firstString, 0 , firstString.Length);            // Write the second string to the stream, byte by byte.
            count = 0;
            while(count < secondString.Length)
            {
                memStream.WriteByte(secondString[count++]);
            }            // Write the stream properties to the console.
            Console.WriteLine(
                "Capacity = {0}, Length = {1}, Position = {2}\n",
                memStream.Capacity.ToString(), 
                memStream.Length.ToString(), 
                memStream.Position.ToString());            // Set the position to the beginning of the stream.
            memStream.Seek(0, SeekOrigin.Begin);            // Read the first 20 bytes from the stream.
            byteArray = new byte[memStream.Length];
            count = memStream.Read(byteArray, 0, 20);            // Read the remaining bytes, byte by byte.
            while(count < memStream.Length)
            {
                byteArray[count++] = 
                    Convert.ToByte(memStream.ReadByte());
            }            // Decode the byte array into a char array 
            // and write it to the console.
            charArray = new char[uniEncoding.GetCharCount(
                byteArray, 0, count)];
            uniEncoding.GetDecoder().GetChars(
                byteArray, 0, count, charArray, 0);
            Console.WriteLine(charArray);
        }
    }
}

Answer 3

MemoryStream ms=new MemoryStream();
byte[] myby=System.Text.Encoding.Default.GetBytes(this.mywebText1.webtext);
ms.Write(myby);这句出错了
byte[] myby=ms.ToArray();
this.richTextBox1.Text=myby.ToString();

Answer 4

转成byte[]之后为什么不能存入类型为IMAGE的数据库字段呀

Answer 5

to ms.Write(myby);这句出错了
ms.Write(myby, offset, count);