Use of file management in C # (Twelfth Day ),

Use of file management in C # (Twelfth Day ),

It's time to sum up. Today, I have studied some application of file management in cloud and college and reviewed the Li's transformation I learned yesterday. Today, I will summarize the issues left over from yesterday and the knowledge I have learned today.

Issues left over yesterday

Lishi conversion (parent rotor class)

Example: Define the parent class People here, including the Name property subclass: Student contains the StadyNum property, an SsHi method.

People p = new Student (); // the action of the parent class is displayed.

Student p1 = p as Student; // The behavior action of the subclass is displayed.

P. Name = "Join"; // attributes in the parent class

P1.StadyNum = "01001"; // attributes in the subclass

P1.SsHi (); // call the subclass Method

Console. ReadKey ();

Theory and Practice:

File Management

Basic operations: Save, copy, move, and delete

Use of Path

String files = @ "D: \ yunhedata \ csharp.txt"; // If a string contains escape characters, add a @ symbol before the string.

Console. WriteLine (Path. GetFileName (files); // obtain the detailed name of the object (with the extension)
Console. WriteLine (Path. GetFileNameWithoutExtension (files); // only obtain the file name without the extension

Console. WriteLine (Path. GetExtension (files); // get the file extension

Console. WriteLine (Path. IsPathRooted (files); // check whether the root Path exists. A boolean value is returned.

String path1 = "c: \ temp ";
String path2 = "subdir \ file.txt ";
Console. WriteLine (Path. Combine (path1, path2); // merge Path

Console. WriteLine (Path. GetDirectoryName (files); // get the folder name

Console. WriteLine (Path. ChangeExtension (files); // change the extension

....

File Application

String file1 = @ "D: \ VS2013.iso ";

File. Greate (file1); // create a file1 File

File. Delete (file1); // Delete a file1 File

String sourcepath = @ "D: \ 11.docx ";
Tring destpath = @ "E: \ 11.docx ";
File. Copy (sourcepath, destpath, true); // Copy the sourcepath File to the destpath path. if it already exists, True indicates that it is overwritten.

File. CreateText (@ "E: \ 11.txt"); // create a text File named 11

File. OpenText (@ "E: \ 11.txt"); // open a text File

File. Move (@ "D: \ 1.rar", @" E: \ 1.rar"); // cut the File 1.rar on the D drive to the E drive.

String [] jGm = File. ReadAllLines (@ "F: \ Gm.txt"); // read all rows of a text document (assembled into an array)

String Gm = File. ReadAllText (@ "F: \ Gm.txt"); // read the text content (splice it into a string)

Returns a Boolean value to determine whether a file exists.

If (File. Exists(@ "F: \ jay.txt "))
{
Console. WriteLine ("file exists ");
}
Else
{
Console. WriteLine ("the file does not exist ");
}

Now, let's summarize it here today. We will learn file streams tomorrow. Come on!