MemoryStream中flush方法有什么作用

lixiaocai123 2010-12-10 03:28:46

今天刚接触到MemoryStream
里面flush方法有什么作用，请各位大侠帮帮忙

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lixiaocai123 2010-12-10

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楼上意思，这个方法什么都没有执行么？

兔子-顾问 2010-12-10

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http://msdn.microsoft.com/zh-cn/library/system.io.memorystream.flush(v=VS.80).aspx

重写 Stream.Flush 以便不执行任何操作。

因为继承自Stream，所以重写了这个方法实际没执行任何代码，流中 Flush 的意义是把缓存数据写入实际的流设备，文件流的做法就是写文件。memorystream则忽略次方法。不需要调用。

MemoryStream对象提供了无需进行IO就可以创建Stream的方法，XmlTextWriter和XmlReader提供快速书写和读取XML内容的方法，结合MemoryStream，就可以直接在内存中构造XmlTextWriter，并用XmlReader进行读取。使用MemoryStream和XmlTextWriter进行书写XML,需要注意两点：XmlTextWriter.Flush操作和重设MemoryStream.Position = 0。 C# <%@ Page Language=”C#”%> <%@ Import Namespace=”System.Xml” %>

MD5 加密解密 public string EnCode(string data) { byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64); byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64); DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider(); int i = cryptoProvider.KeySize; MemoryStream ms = new MemoryStream(); CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateEncryptor(byKey,byIV), CryptoStreamMode.Write); StreamWriter sw = new StreamWriter(cst); sw.Write(data); sw.Flush(); cst.FlushFinalBlock(); sw.Flush(); return Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length); }

shp2kml+源代码 public byte[] ToKML() { MemoryStream ms = new MemoryStream(); StreamWriter sw = new StreamWriter(ms); XmlTextWriter kml = new XmlTextWriter(sw); //kml.Namespaces = true; kml.Formatting = Formatting.Indented; kml.WriteStartDocument(); kml.WriteStartElement("kml"); kmlRoot.ToKML(kml); kml.WriteEndElement(); kml.WriteEndDocument(); kml.Flush(); kml.Close(); return ms.ToArray(); }

C# 加密 JAVA 解密源码 using System; using System.IO; using System.Security.Cryptography; namespace WindowsApplication1 { /// /// Security 的摘要说明。 /// public class Security { const string KEY_64 = "flxmtdes"; const string IV_64 = "flxmtIvS"; public Security() { // // TODO: 在此处添加构造函数逻辑 // } public static string Encode(string data) { byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64); byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64); DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider(); int i = cryptoProvider.KeySize; MemoryStream ms = new MemoryStream(); CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateEncryptor(byKey, byIV), CryptoStreamMode.Write); StreamWriter sw = new StreamWriter(cst); sw.Write(data); sw.Flush(); cst.FlushFinalBlock(); sw.Flush(); return Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length); } public static string Decode(string data) { byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64); byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64); byte[] byEnc; try { byEnc = Convert.FromBase64String(data); } catch { return null; } DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider(); MemoryStream ms = new MemoryStream(byEnc); CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateDecryptor(byKey, byIV), CryptoStreamMode.Read); StreamReader sr = new StreamReader(cst); return sr.ReadToEnd(); } } }

一、测试方法是否结果相同首先看下面两段代码1是StreamWriter.Write 2是Stream.Write： 1 代码如下:Stream ms = new MemoryStream();string str = “这是测试字符串”;StreamWriter sw = new StreamWriter(ms, Encoding.UTF8);sw.Write(str);sw.Flush(); 2 代码如下:Stream ms = new MemoryStream();string str = “这是测试字符串”;byte[] buffer = Encoding.UTF8.GetBytes(s

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