求文件的MD5,SHA1值

求文件的MD5,SHA1值,支持拖放

usingSystem;
usingSystem.Collections.Generic;
usingSystem.ComponentModel;
usingSystem.Data;
usingSystem.Drawing;
usingSystem.Text;
usingSystem.Windows.Forms;
usingSystem.Security.Cryptography;
usingSystem.IO;

namespaceFileHashCalc
...{
publicpartialclassForm1:Form
...{
publicForm1()
...{
InitializeComponent();
}

/**////<summary>
///求文件的MD5值
///</summary>
///<paramname="strFileName">文件的绝对路径</param>
///<returns>文件的MD5值</returns>
privatestringGetFileMD5(stringstrFileName)
...{
if(File.Exists(strFileName)==false)returnnull;
MD5myMD5=MD5.Create();
FileStreammyFileStream=newFileStream(strFileName,FileMode.Open,FileAccess.Read);
byte[]data1=newbyte[myFileStream.Length];
myFileStream.Read(data1,0,data1.Length);
myFileStream.Close();

byte[]data2=myMD5.ComputeHash(data1);
StringBuildermyBuilder=newStringBuilder();

for(inti=0;i<data2.Length;i++)
...{
myBuilder.Append(data2[i].ToString("x2"));
}

returnmyBuilder.ToString();
}

/**////<summary>
///求文件的SHA1值
///</summary>
///<paramname="strFileName">文件的绝对路径</param>
///<returns>文件的SHA1值</returns>
privatestringGetFileSHA1(stringstrFileName)
...{
if(File.Exists(strFileName)==false)returnnull;
SHA1mySHA1=SHA1.Create();
FileStreammyFileStream=newFileStream(strFileName,FileMode.Open,FileAccess.Read);
byte[]data1=newbyte[myFileStream.Length];
myFileStream.Read(data1,0,data1.Length);
myFileStream.Close();

byte[]data2=mySHA1.ComputeHash(data1);
StringBuildermyBuilder=newStringBuilder();

for(inti=0;i<data2.Length;i++)
...{
myBuilder.Append(data2[i].ToString("x2"));
}
returnmyBuilder.ToString();
}

privatevoidForm1_DragEnter(objectsender,System.Windows.Forms.DragEventArgse)
...{
if(e.Data.GetDataPresent(DataFormats.FileDrop))
...{
e.Effect=DragDropEffects.Link;
}
else
...{
e.Effect=DragDropEffects.None;
}
}

privatevoidForm1_DragDrop(objectsender,System.Windows.Forms.DragEventArgse)
...{
if(((System.Array)e.Data.GetData(DataFormats.FileDrop)).Length>1)
...{
MessageBox.Show("文件数大于1","温馨提示",MessageBoxButtons.OK,MessageBoxIcon.Information);
}
else
...{
textBox1.Text=GetFileMD5(((System.Array)e.Data.GetData(DataFormats.FileDrop)).GetValue(0).ToString());
textBox2.Text=GetFileSHA1(((System.Array)e.Data.GetData(DataFormats.FileDrop)).GetValue(0).ToString());
}
}
}
}