C#

The single question mark---is used to set the initial value of the variable, assigning the variable (int type) to NULL instead of 0!Double question mark---used to judge and assign a value, first determine whether the current variable is null, if it

QQ:1187362408 welcomes technical exchanges and learningC#base64 picture Format (BASE64):Todo:1, Prefix: Server relative path; suffix: Picture storage format: Image,bmp and other picture formats , such as:(.. gen/children/yz.jpg)2,guid format picture,

The performance side can also accept the loop 1000 times the normal switch is used for 0.001 seconds, the extension function is 0.002 seconds, if the large project can be completely ignored in the case of load balancing, small projects will not care

1. Get current Browser Information HttpContext.Current.Request.Browserstring browser = HttpContext.Current.Request.Browser.Browser;Value of Brower: Internetexplorer,firefox,chrome2. Character transcoding/decoding in Chinese garbled

//To create a list generic collectionlistint> IList =Newlistint>(); IList. ADD (1); IList. ADD (9); IList. AddRange (New int[] {234, at, A,2, the,234 }); IList. Insert (2,1231231); for(inti =0; I ) {Console.WriteLine (ilist[i]); }

C # program, how to effectively reduce CPU usage, Recently developed projects use a third-party program ffmpeg that consumes CPU resources to process videos. So I found out how to solve this problem on the Internet. Therefore, we can draw a

[C #] talking about covariant and InverterWhat are the terms of the covariant and inverter covariant and the inverter? The former refers to a type that can be derived to a lower degree (not specific) than the original specified derivative type, the

C program for judging the size and orderConcept Large-end format: the high bytes of word data are stored in the low address, while the low bytes of word data are stored in the high address.Small-end format: In contrast to the large-end storage

When using c # To Access the Access database, the system prompts that the installable ISAM cannot be found. When using c # To Access the Access database, the prompt is displayed.Unable to find the installable ISAMSuch: The Code is as

DevExpress re-compilation replace strong naming change source code, devexpress source code Taking DevExpress 11.1.8 as an example, the following conditions must be met: 1. You must have all source code SourceCode of the corresponding DXperience

C # DataSet: DataSet object ADO. A prominent feature of the NET data access technology is that it supports offline access. The core of this offline access technology is the DataSet object, which enables offline access by storing data in the

C # restrictions on concurrent programming concurrent access to resources using SemaphoreSlimSummary When multiple tasks or threads run in parallel, it is difficult to avoid concurrent access to some limited resources. You can consider using

Not complex Autofac injection, not complex Autofac Injection Private static void SetAutofacWebAPI () {var builder = new ContainerBuilder (); # region configuration registration method string dataType = ConfigurationManager. appsetetype

C # development mode-multi-level dll reference, C # The solution provides two reference methods: project reference and dll physical file reference.I. Strict reference of project references. The project file must be included in the solution. The

Group-based paging and rdlc reports under the rdlc report Matrix ControlScenario:Use rdlc to develop reports. For example, the Order product report shows multiple orders. An order consists of multiple products that are dynamically generated, and the

C # Modifier Modifiers are used to restrict the declaration of types and type members. modifiers in C # can be divided into four parts by function: attribute modifier, access modifier, class modifier and member modifier. Property modifier:

C # multithreading practices-synchronization system, Lock Statement (that is, Monitor. enter/Monitor. exit) is usually used when a thread synchronizes exclusive access to a piece of code or resources, however, it is complicated to implement

C # simple use of multithreading and common parameters, Using System; using System. collections. generic; using System. componentModel; using System. data; using System. drawing; using System. linq; using System. text; using System. threading. tasks;

C # Read the custom nodes in Appconfig, When using Nlog today, I found a problem that I did not pay attention to before.   In the past, my app configuration files were written in this way. Of course, xml will be used when there are many

Trace. WriteLine is used to locate the problem that is difficult to reproduce. In a recent project, a bug was found in the customer testing environment (UAT), but repeated attempts failed to reproduce it in the development environment and QA