Visual C#程序設(shè)計(jì)技巧小結(jié)

2010-08-28 10:45:06來源:西部e網(wǎng)作者:

  獲取文件的版本信息:

FileVersionInfo myFileVersionInfo1 = FileVersionInfo.GetVersionInfo("D:\\TEST.DLL");
textBox1.Text="版本號(hào): " + myFileVersionInfo1.FileVersion;

  更改文件屬性,刪除只讀文件:

  下例欲將E:\test.txt文件拷貝至D:\tmp\test.txt,但D:\tmp\test.txt已經(jīng)存在。

//File.Copy(sourceFile,destinationFile,true); 用來拷貝文件
//當(dāng)destinationFile已經(jīng)存在時(shí),無法將文件file1拷貝到目標(biāo)文件,
//因此先刪除destination文件,F(xiàn)ile.Delete()方法不能刪除只讀文件,
//因此,如果文件屬性為只讀(Attributes屬性中會(huì)包含有"ReadOnly"),
//先把文件屬性重置為Normal,然后再刪除:
string file1="E:\\test.txt";
string destinationFile="d:\\tmp\\test.txt";
if(File.Exists(destinationFile))
{
 FileInfo fi=new FileInfo(destinationFile);
 if(fi.Attributes.ToString().IndexOf("ReadOnly")!=-1)
  fi.Attributes=FileAttributes.Normal;
  File.Delete(destinationFile);
}
File.Copy(file1,destinationFile,true);

  C#中字符串的格式化及轉(zhuǎn)換成數(shù)值的方法

  字符串轉(zhuǎn)換成數(shù)字,比如"1234"轉(zhuǎn)換成數(shù)字1234:

string str="1234";
int i=Convert.ToInt32(str);

  格式化字符串,向長(zhǎng)度小于30的字符串末尾添加特定字符,補(bǔ)足n個(gè)字符,使用String類的PadRight(int,char)方法:

String str="1234";
str=str.PadRight(30,' ') //向長(zhǎng)度小于30的字符串末尾添加空格,補(bǔ)足30個(gè)字符

  按行讀寫文件

  判斷文件是否存在:File.Exists(string filePath)

  判斷目錄是否存在:Directory.Exists("D:\\LastestVersion")

  按行讀取文件:

int fileCount=0;
// Open the file just specified such that no one else can use it.
StreamReader sr = new StreamReader(textBox1.Text.Trim());
while(sr.Peek() > -1)//StreamReader.Peek()返回下一個(gè)可用字符,但不使用它
{
 listBox1.Items.Add(sr.ReadLine());
 fileCount++;
}
sr.Close();

  按行寫入文件:

StreamWriter sw = new StreamWriter("D:\\result.txt");
for(int i=0;i<10;i++)
{
 sw.WriteLine("這是第"+i.ToString()+"行數(shù)據(jù)");
}

  文件目錄對(duì)話框的使用

  文件對(duì)話框即過濾條件的使用:

string resultFile="";
OpenFileDialog openFileDialog1 = new OpenFileDialog();
openFileDialog1.InitialDirectory = "D:\\Patch" ;
openFileDialog1.Filter = "All files (*.*)|*.*|txt files (*.txt)|*.txt" ;
openFileDialog1.FilterIndex = 2 ;
openFileDialog1.RestoreDirectory = true ;
if(openFileDialog1.ShowDialog() == DialogResult.OK)
resultFile=openFileDialog1.FileName;

  目錄對(duì)話框的使用:

string resultFolder="";
FolderBrowserDialog openFolderDialog1=new FolderBrowserDialog();
openFolderDialog1.RootFolder=Environment.SpecialFolder.MyComputer;
if(openFolderDialog1.ShowDialog()==DialogResult.OK)
resultFolder=openFolderDialog1.SelectedPath;

關(guān)鍵詞:C#