How to read querystring values in ASP.NET Core?

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Aryan Kumar · Answer

There are a few ways to read query string values in ASP.NET Core.

Using the Request.QueryString property: The Request.QueryString property is a dictionary that contains all of the query string parameters for the current request. You can access a query string parameter by using its name as the key. For example, to get the value of the name query string parameter, you would use the following code:

C#

var name = Request.QueryString["name"];

Using the IQueryCollection interface: The IQueryCollection interface is an abstract interface that is implemented by the QueryString class. You can use the IQueryCollection interface to iterate through all of the query string parameters and to get the value of a specific query string parameter. For example, the following code will iterate through all of the query string parameters and print their values:

C#

foreach (var queryParam in Request.QueryString)
{
    Console.WriteLine(queryParam.Key + " = " + queryParam.Value);
}

Using the QueryParser class: The QueryParser class is a class that can be used to parse query strings. You can use the QueryParser class to get a list of all of the query string parameters and their values. For example, the following code will get a list of all of the query string parameters and their values and then print them:

C#

var queryParser = new QueryParser(Request.QueryString);
var queryParamList = queryParser.GetQueryParameters();
foreach (var queryParam in queryParamList)
{
    Console.WriteLine(queryParam.Key + " = " + queryParam.Value);
}

Which method you use to read query string values in ASP.NET Core will depend on your specific needs. If you need to access a single query string parameter, then using the Request.QueryString property is the simplest way to do it. If you need to iterate through all of the query string parameters or if you need to get a list of all of the query string parameters and their values, then using the IQueryCollection interface or the QueryParser class is a better option.

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How to read querystring values in ASP.NET Core?

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