.Net Core

DBNull in C, When a field in the database is not required, an empty string is often inserted when data is inserted into the database. DBNull can solve this problem. /// /// insert data /// /// /// private void button2_Click (object sender,

Asp: get request writing and get request writingPreface The first parameter of the open method of the XMLHttpRequest object is request-type. The value can be get or post. This article describes get requests.The purpose of a get request is to obtain

Circular references are detected when the serialization type is XX. Error cause: the table has a primary-foreign key relationship with other tables. Solution: (1) Add db. Configuration. ProxyCreationEnabled = false; // No error is returned. (2)

Serializable and serializablejson 1. Use NuGet to install Newtonsoft. Json. 2. Create a class to be serialized. Public class Person { Public string Name {get; set ;} Public int Age {get; set ;} } Var obj = new Person (); 3. var result =

Convert. ToInt32 (null or ""), convert. toint32null I forgot to write it first. Console. writeLine ("Empty output Conversion Result = {0}", Convert. toInt32 (""); // Convert. toInt32 cannot be converted to "" null values, and an error is reported

MVC Helper Methods, mvchelpermethodsIn. net MVC, for example, @ Url. action () @ Url. conyent () @ Html. displayfor () and so on are the Helper Methods help Methods we will talk about here. What are they doing? where are their main purposes? They

Necessity of database design and necessity of Database DesignWhy design the database? When we need to store a small amount of data, we certainly do not need to design the database, but it is necessary to design the database as the demand for data

Record the debugging tree (to facilitate specific calls) and the debugging treePublic static void DebugFunctionTree (string message) {try {System. diagnostics. stackTrace st = new System. diagnostics. stackTrace (); System. diagnostics. stackFrame []

Nested use of the asp.net Frameset framework set, asp. netframeset Http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd> FrameSet framework set

UWP development (4) -- custom CommandBar and uwpcommandbar Hello, everyone, I 've returned to the UWP development getting started series again. I may not be able to adapt to the just-coming back. So today we are going to talk about a simple, custom

MVC, EF small encapsulation, mvcef Encapsulation 1. EF is often used in projects. Sometimes most add, delete, modify, and query operations are repetitive. This encapsulation is for rapid development, and various architectural ideas are not taken

. Net proportional scaling to generate thumbnails, Generating thumbnails is a very common function. I found a method to rewrite some code, which is practical and useful.. net also generates thumbnails without deformation. /// /// generate a

Asp.net uses DataTable to construct a Json string, This example describes how asp.net uses DataTable to construct a Json string. We will share this with you for your reference. The details are as follows: /// /// convert the able to json // /// /

Asp.net implements two methods for outputting images in binary streams, This example describes two methods for asp.net to output images in binary streams. We will share this with you for your reference. The details are as follows: Method

Asp.net is a simple method for page skin replacement, This example describes how to use asp.net to perform page skin replacement. We will share this with you for your reference. The details are as follows: Here the page skin replacement effect is

To support ASP. NET5 cross-platform, Jexus adds new initiatives, Jexus runs on Linux/FreeBSD platform to support ASP. NET is famous for its high-performance HTTP server and reverse proxy server. After the 5.6 version completes the support for the

[Reconstruction learning] 00 order, When writing code, we are increasingly aware of the importance of refactoring. As a conscientious programmer, I think it is really necessary for us to write clear code, rather than simply understanding the

C #/. net qiniu cloud storage uploads images (files, Qiniu cloud storage official: C # SDK (http://developer.qiniu.com/docs/v6/sdk/csharp-sdk.html) Registered as a standard user can Get: 10 Gb permanent free storage space/10 Gb download traffic

ActiveX (2) Js listens to ActiveX events and jsactivex   In the previous article: ActiveX (1) in the First simple Demo, JavaScript can be used to call methods in ActiveX in one way, in many cases, the execution of ActiveX methods is time-consuming

Silverlight simple data binding 1, silverlight binding Data Binding is the medium between the user interface and the data source. Through binding, data can be transmitted between the interface and the data source. Data Binding is completed by the