string empty

When I download an object today, I found that the object name should be retrieved from a field in the database, and this field does not guarantee that invalid characters will not be used, such \/:*? "<> | I wrote a simple method for replacement. The

ArticleDirectory 1. Two simple string extension methods 2. datatable Extension Method 1. Quick assignment of two attributes of the same type of object (fast deep cloning) Sometimes we construct an instance A and assign a value.

(1) NULL The null keyword is a text value that does not reference any object's null reference. Null is the default value of the reference type variable. Then, only the referenced variable can be NULL. If int I = null, it is not possible because Int

Class scope and namespace continuation (Name Search rules)   In version 4, there is a paragraph about the Name Lookup in the class scope: So far, in our program,Name Search (the process of searching for declarations that match the given name)Is

usingSystem;usingSystem.Collections.Generic;usingsystem.web;usingSystem.Web.Services;usingSystem.Web.Script.Serialization;usingSystem.Xml;usingSystem.Collections;usingSystem.Linq;/// ///Summary description of Wsxml/// [WebService (Namespace ="http://

This article makes a rough explanation of the difference between them. string. Empty is the equivalent of " Typically used for initialization of strings Like what: String A; Console.WriteLine (a);//There will be an error, because there is no

Record the Webapi signature mechanism and webapi signature mechanism First, the reason for writing this article is that the interface in a recent project has been manually called, resulting in database data being changed. Although it was inactive,

Uploading large files over HTTP may be difficult. This is mainly because of its non-continuity, which makes it very dangerous to upload files ". Especially for large files (hundreds of MB or even GB files), I always feel that I am not steadfast, and

Reprinted: http://www.cnblogs.com/bit-sand/archive/2007/07/27/834148.html Today, I suddenly made two performance tests on Null strings. I would like to share with you! The result is as follows: Comparison of the two assignment modes:String STR = "";

Use icsharpcode. sharpziplib. DLL to implement simple addition and decompression This article mainly provides a function class that uses icsharpcode. sharpziplib. DLL to implement simple addition and decompression. icsharpcode. sharpziplib. dll can

In this case, when processing an http post command in the background, the time sequence is handed over to the browser, then Javascript is run, and then the server is returned, and subsequent operations are continued. If you draw a sequence chart,

Uploading large files over HTTP may be difficult. This is mainly because of its non-continuity, which makes it very dangerous to upload files ". Especially for large files (hundreds of MB or even GB files), I always feel that I am not steadfast, and

StringbuilderIt turns out to be a collection based on a linked list rather than an array. Instead of increasing capacity by 2, it adds a stringbuilder node with the capacity of int num = math. max (minblockcharcount, math. min (this. length, 8000);

Let's look at an effect chart first. When you define only one str instead of allocating memory for it, use string str=null, but you must assign a value to it before you use it, such as str= "XXXX", which is initialized for it.and string str=

Reprint Address: http://www.cnblogs.com/codeon/p/6123863.htmlThe previous article talked about the design of interface security, if you do not see the previous blog, it is recommended to see this after reading.Through the discussion of the park

Public Partial Class Watertextbox: textbox { Private Readonly Label lblwatertext = New Label (); Public Watertextbox () {initializecomponent (); lblwatertext. borderstyle = borderstyle. None; lblwatertext. Enabled = False ; Lblwatertext.

/* Creator: the blog of caidao jushi* Creation date: January 1, August 31, 2014* Function: obtains information about a computer.**/ Namespace net. String. consoleapplication{Using system;Using system. Management; Public class computerhelper{/// ///

ExtJsGridPanel shows code for adding, deleting, and modifying results. For more information, see. 1. First, let's take a look: 2. ext code The Code is as follows: /// Ext. namespace ('xqh. ExtJs. framework ');XQH. ExtJs. Frame. RoleManage =

Engaged in ASP. NET development may be exposed to some chart controls, such as OWC and ZendGraph. These controls have a feature that we can operate like. objects in. NET control some of their attributes, which may cause permission issues during

This article tells you about the message processing related to the public account in. net public account development. it is very detailed. For more information, see. I. Preface The message processing on the public platform is still relatively