what is iactionresult in asp.net core?
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In general terms IActionResult type is a base abstraction of an action result. It is used as the base of other derived action results that represent specific response types, of which there are many. Reference Asp.Net Core Action Results Explained.
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['Try-catch-finally.', 'Overriding OnException method.', 'Using the [HandleError] attribute on actions and controllers.', 'Setting a global exception handling filter.', 'Handling Application_Error event.', 'Extending HandleErrorAttribute.']
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NET Core is a runtime. It can execute applications that are built for it. ASP.NET Core is a collection of libraries that form a Framework for building web applications. ASP.NET Core libraries can be used on both .
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The IQueryable interface is intended for implementation by query providers. ... The IQueryable interface inherits the IEnumerable interface so that if it represents a query, the results of that query can be enumerated. Enumeration causes the expression tree associated with an IQueryable object to be executed.
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Here are some advantages of using the IHttpActionResult interface: Simplifies unit testing your controllers. Moves common logic for creating HTTP responses into separate classes. Makes the intent of the controller action clearer, by hiding the low-level details of constructing the response.
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Yes. By installing . NET Core Runtime 2.2. 3, you can run apps which target netcoreapp2.
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Configuration in ASP.NET Core is performed using one or more configuration providers. Configuration providers read configuration data from key-value pairs using a variety of configuration sources: Settings files, such as appsettings.
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['protected void Page_Load(object sender, EventArgs e)', '{', 'foreach(string key in Session.Contents)', '{', 'string value = "Key: " + key +", Value: " + Session[key].ToString();', 'Response.Write(value);', '}', '}']
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In ASP.NET, you probably spend most of your time creating . aspx files with . cs files as code behind or use . ... ashx file instead of an . aspx file is that your output is not going to a browser but to an xml-consuming client of some kind.
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While querying data from the database, IEnumerable executes "select query" on the server-side, loads data in-memory on the client-side and then filters the data. IEnumerable is beneficial for LINQ to Object and LINQ to XML queries.
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ExecuteScalar() only returns the value from the first column of the first row of your query. ExecuteReader() returns an object that can iterate over the entire result set. ExecuteNonQuery() does not return data at all: only the number of rows affected by an insert, update, or delete.
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There is a very important difference if the source of the data is Entity Framework: Find will find entities in the 'added' state that are not yet persisted, but Where will not. This is by design. Find is only implemented in List<T> , while Where(). FirstOrDefault() works with all IEnumerable<T> .
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The IsPostBack property can be used to determine if the page is submitted to itself. When a form is submitted back to the same page that contains it, it's called a post back. ASP.NET provides a property called IsPostBack that is TRUE when the page is being loaded as a result of a post back, and is FALSE otherwise.
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The IHttpActionResult interface was introduced in Web API 2. Essentially, it defines an HttpResponseMessage factory. Here are some advantages of using the IHttpActionResult interface: Simplifies unit testing your controllers. Moves common logic for creating HTTP responses into separate classes.
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DataRow result = (from row in dt. AsEnumerable() where row. Field<int>("OrderID") == 1 select row). SingleOrDefault();
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IEqualityComparer<T> is a generic interface defined in the . NET framework version 2.0 and used in many standard classes, including several LINQ operators. The interface can be implemented to allow customised comparison of values and objects.
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In our view, we define a Javascript function to send the data with an Ajax message. In the function, first we create the array with named entries called dataToSend. We use a JQuery Ajax post to an URL. That means our Action function in the controller should have the '[HttpPost]' attribute.