Query string in blazor| how to use query string in blazor c#

 Query string in blazor| how to use query string in blazor c#

In Blazor, you can pass query strings as parameters to a component by utilizing the `NavigationManager` service. The query string can contain key-value pairs that hold additional information.

Here's an example of how to pass and retrieve query string parameters in Blazor:

1. Import the `Microsoft.AspNetCore.Components.Navigation` namespace in your component:

csharp

@inject NavigationManager NavigationManager

2. Pass the query string parameters when navigating to the component. For example, if you have a component named `MyComponent` and want to pass the parameters `id=123` and `name=John`, you can navigate to it using the following code:

csharp

NavigationManager.NavigateTo("mycomponent?id=123&name=John");

3. Retrieve the query string parameters in the `OnInitializedAsync` lifecycle method or any other appropriate method in your component:

csharp

@inject NavigationManager NavigationManager

protected override async Task OnInitializedAsync()

{

    var uri = new Uri(NavigationManager.Uri);

    var query = QueryHelpers.ParseQuery(uri.Query);

    

    if (query.ContainsKey("id"))

    {

        var id = query["id"].ToString();

        // Use the id parameter as needed

    }

    

    if (query.ContainsKey("name"))

    {

        var name = query["name"].ToString();

        // Use the name parameter as needed

    }

}

In this example, the `NavigationManager` service is injected into the component. The `Uri` property of the `NavigationManager` provides the current URL, and the `QueryHelpers.ParseQuery` method parses the query string into a dictionary of key-value pairs. You can then check if the dictionary contains specific keys and retrieve their values.

Note that the query string parameters are typically accessed in an asynchronous lifecycle method like `OnInitializedAsync`. If you need to access them synchronously, you can use the `OnInitialized` method instead.

By following these steps, you can pass and retrieve query string parameters in Blazor components using the `NavigationManager` service.

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