Visual C # Summary of programming skills

Get the file version information:

FileVersionInfo myFileVersionInfo1 = FileVersionInfo. GetVersionInfo ("D: \ TEST. DLL "); TextBox1.Text = "version:" + myFileVersionInfo1.FileVersion;

Modify file attributes and delete read-only files:

In the following example, you want to copy the E: est.txt file to D: mpest.txt, but D: mpest.txt already exists.

// File. Copy (sourceFile, destinationFile, true); used to Copy an object // When destinationFile already exists, you cannot copy file file1 to the target file, // Delete the destination File first. The File. Delete () method cannot Delete the read-only File, // Therefore, if the file attribute is read-only (the Attributes attribute contains "ReadOnly "), // First reset the file property to Normal and then delete the file: 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 );

How to format and convert a string to a value in C #

Convert a string to a number, for example, "1234" to a number 1234:

String str = "1234 "; Int I = Convert. ToInt32 (str );

Format the String, add a specific character to the end of a String of less than 30 to supplement n characters, and use the PadRight (int, char) method of the String class:

String str = "1234 "; Str = str. PadRight (30,) // Add a space to the end of a string less than 30 characters to Supplement 30 characters

Read and Write files by row

Determine whether the File Exists: File. Exists (string filePath)

Determine whether the Directory Exists: Directory. Exists ("D: \ LastestVersion ")

Read files by row:

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 () returns the next available character, but does not use it { ListBox1.Items. Add (sr. ReadLine ()); FileCount ++; } Sr. Close ();

Write files by row:

StreamWriter sw = new StreamWriter ("D: \ result.txt "); For (int I = 0; I <10; I ++) { Sw. WriteLine ("this is the" + I. ToString () + "row data "); }

Use of the file directory dialog box

The file dialog box shows how to use the filter conditions:

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;

Use of the Directory dialog box:

String resultFolder = ""; FolderBrowserDialog openFolderDialog1 = new FolderBrowserDialog (); OpenFolderDialog1.RootFolder = Environment. SpecialFolder. MyComputer; If (openFolderDialog1.ShowDialog () = DialogResult. OK) ResultFolder = openFolderDialog1.SelectedPath;