C#

When a null field is found in the Linq query condition, the following error occurs: variable' <> h _ TransparentIdentifier2 'of type referenced from scope '', but it is not defined, linqtosql. This error is reported when I run the following linq

C #: Why is the traffic statistician invalid when a referer is forged in webbrowser ?, Using webbrowser to forge referer: webBrowser1.Navigate (url, "_ self", null, "Referer: http://www.xxx.com ") During this period, I have been studying how to set

Test. NET code protection software (code obfuscation and encryption) and test. net With the help of Microsoft's user-friendly development tools visual studio and MSDN, the development efficiency of. NET is indeed high. However. NET, like JAVA,

C #6.0 (C # vNext): Nameof ExpressionsThe Nameof Expressions parameter is the expression for obtaining the name.First look at the example:Previous writing: void Foo(Bar bar){ if (bar == null) { throw new ArgumentNullException("bar");

C #6.0 (C # vNext): Exception-Handling ImprovementsIn C #6.0, the new feature wraps two improvements to exception handling:Async and await can be used in catch block. The async and await introduced in C #5.0 cannot be used for catch block at that

C # Excel NPOI operations, Recently, I want to develop a C # Excel tool, but after installing the Office, there are various component conflicts. Later I found NPOI and thought it was very useful. Here we will share with you, Official Website:

C # easily draw the inclusion relationship diagram of c-Language header files, Recently, I am working on a project porting job. The project is very large and there are more than 1800 c files. For some purposes, you want to analyze the. h file

AccessHelper, accesshelper. cs Code:Using System; using System. data; using System. configuration; using System. data. oleDb; using ahwildlife. utils; // /// AccessHelper abstract description /// public class AccessHelper {# region variable

C # Use NPOI to export an Excel class (simple Edition ), Code:Using System. data; using System. IO; using NPOI. HSSF. userModel; using NPOI. SS. userModel; namespace ahwildlife. utils {// // Excel tool class // use NPOI to generate Excel ///

C # Quick sorting algorithm, Today, I reviewed the following sorting algorithms, including the Bubble sorting method and direct sorting method, which are relatively simple, but it is difficult to quickly sort the algorithm. So I will focus on

C # multi-thread programming in the language. It is completely a bachelor's knowledge in OS.Basic knowledge: parameters of the Thread class without parameters and the Thread class with parameters are parameter pointers. You can input a function

Type conversion in C, Value types include integer, floating point, Boolean, String, DateTime, and Enum E (······)), structure type (Struct S (······))   Reference types include: string type, Class type (Object, Class C (·), interface type (Iterface

Use GDI + to easily create a thumbnail. Gdi + is quite useful.   1> Image needs a CLSID parameter to save the Image, which can be obtained as follows: [Cpp]View plaincopy Int GetEncoderClsid (const WCHAR * format, CLSID * pClsid) { UINT num = 0;

Combining multiple expressions combines multiple System. Linq. Expressions. Expression and linqjoin using System;using System.Collections.Generic;using System.Linq;namespace System.Linq.Expressions{ public static class ExpressionExtensions {

NotImplementedException does not implement this method or operation, notimplemented When you use DevExpress to bind DataSource to the control CheckedListBoxControl, an exception "NotImplementedException does not implement this method or operation"

Youku real video address resolution, video resolutionAnalysis of Youku's real video address-November October 7, 2014 Sequence: Youku updated the algorithm (long ago, haha ...), Therefore, many blog parsing algorithms are no longer available. Many

Dapper. rainbow, rainbow using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Data.SqlClient; using Dapper; // to have a play, install Dapper.Rainbow from nuget namespace TestDapper{ class Program {

C # Study Notes (2) -- variables and expressions, Ps: using these two keywords can easily collect the header file (although VS has integrated this function =) Static void Main (string [] args) {int a; string s; a = 17; s = "\" a \ "is"; Console.

C # function parameters, When the function accepts parameters, the subordinate content must be specified. Parameter Match: when calling a function, you must make the parameter exactly match the parameter specified in the function definition. This

Delegation, Lambda expressions, event series 04, how the delegation chain is formed, multicast delegation, calling the delegation chain method, delegation chain Exception Handling, lambda expressions The delegate is multicast delegate. We can assign