VisualC#程序設(shè)計(jì)技巧小結(jié)

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獲取文件的版本信息:
    FileVersionInfo myFileVersionInfo1 = FileVersionInfo.GetVersionInfo("D:\\TEST.DLL");
    textBox1.Text="版本號: " + 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)");
    }
    文件目錄對話框的使用
    文件對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;
    目錄對話框的使用:
    string resultFolder="";
    FolderBrowserDialog openFolderDialog1=new FolderBrowserDialog();
    openFolderDialog1.RootFolder=Environment.SpecialFolder.MyComputer;
    if(openFolderDialog1.ShowDialog()==DialogResult.OK)
    resultFolder=openFolderDialog1.SelectedPath;