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; |