【. NET deep breathing "ZIP file Operations (2): Dynamically generate ZIP Documents

Through the introduction of a bad article, you know, Ziparchive class represents a Zip document instance, in addition to using the method listed in the previous article to read and write the zip file, you can also directly through the Ziparchive class, dynamically generate a zip file.

File stream operations believe that. NET Dev is not a stranger, ziparchive can either create a zip document in memory or create a new zip file. Because the constructor of the Ziparchive class needs to pass in a Stream object to read and write, the stream can be a stream of memory, or it can be a stream of files.

After you create an ziparchive instance, you can create a compressed item in a compressed document by calling the Createentry method directly, and a Ziparchiveentry instance is returned when you create it.

The Createentry method needs to specify the name of the created compressed item entity, which is the name of the file in the zip document.

If the name is Abc.jpg, then the file abc.jpg is stored in the root directory of the zip. If you want the compression item to be hierarchical, you can specify a relative path.

For example, if you specify One\\abc.txt, a directory named one is created under the root of the zip document, and then the file Abc.txt is created in the one directory. "\ \" can be written as "/", that is, one/abc.txt.

If you enter the name A/b/d.doc, you will create a directory in the zip document, create the B directory under the A directory, and then create the file D.doc in the B directory.

After the Ziparchiveentry instance is created, the open method can be called, and the method returns a Stream object through which the data can be written to the compressed file.

When the zip document is complete, call the Dispose method of the Ziparchive instance to release the resource.

Next look at an example:

            using(FileStream fsout =NewFileStream ("Test.zip", FileMode.OpenOrCreate, FileAccess.ReadWrite)) {                //Create a Zip document instanceZiparchive archive =Newziparchive (fsout, ziparchivemode.create); //create a file under the root directoryZiparchiveentry Entry1 = archive. Createentry ("first item. txt", Compressionlevel.optimal); //writing content to a file                using(StreamWriter wt =NewStreamWriter (Entry1. Open ())) {wt. WriteLine ("This is the first file to compress. "); }                //create a file in relative directoryZiparchiveentry Entry2 = archive. Createentry ("the second \\data.txt", Compressionlevel.optimal); //writing content to a file                using(StreamWriter wt =NewStreamWriter (Entry2. Open ())) {wt. WriteLine ("This is the second file that is compressed. "); }                //Create a third fileZiparchiveentry Entry3 = archive. Createentry ("the third/document.txt", Compressionlevel.optimal); //writing content to a file                using(StreamWriter wt =NewStreamWriter (Entry3. Open ())) {wt. WriteLine ("This is the third file that is compressed. "); }                //to release the zip Document object after the operation is completeArchive.            Dispose (); }

The above code creates a zip document with the following structure:

Isn't it simple? Well, because of the serious shortage of money on the cast, this episode is over.

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【. NET deep breathing "ZIP file Operations (2): Dynamically generate ZIP Documents