How do I resolve the error “The type arguments for method ‘TypeInference.CreateListViewTemplates_4(RenderTreeBuilder, int, int, RenderFragment)’ cannot be inferred from the usage. Try specifying the type arguments explicitly”?
This error would occur when the generic Blazor component is unable to infer the type argument from the parameters. So, the compiler does not know which type of argument is intended. To resolve this, provide the intended type parameter explicitly. Refer to this link for more details.
How do I resolve the error “There was an unhandled exception on the current circuit, so this circuit will be terminated. For more information, turn on detailed exceptions in ‘CircuitOptions.DetailedErrors’.”?
To resolve and get more information about the error, enable the ‘CircuitOptions.DetailedErrors’ configuration in the ConfigureServices method in Startup.cs file. [Startup.cs] For the debug and development environment, initialize the IWebHostEnvironment and provide the web hosting environment information to the Startup constructor. Finally, add the AddCircuitOption configuration to the ConfigureServices method in the Startup.cs file. [Startup.cs]
How do I create and use a custom validation component?
To create a custom validation component in Blazor, follow these code steps: Create a Blazor Server or WebAssembly application and install the System.ComponentModel.Annotations NuGet package using NuGet Package Manager. Now, create a new custom validation class in the Pages folder and restrict the user to enter only “admin” in the password field.[CustomValidatorAttribute.cs] using System.ComponentModel.DataAnnotations; namespace {{Your_App_Name}}.Pages{ public class CustomValidationAttribute : ValidationAttribute { public string? ValidUserName { get; set; } protected override ValidationResult? IsValid ( object? username, ValidationContext validationContext ) { var content = username?.ToString()?.ToLower(); if (content!.Equals(ValidUserName?.ToLower())) { return null; } return new ValidationResult(ErrorMessage, new[] { validationContext.MemberName }); } }} Use the created custom validator attribute in the Razor component. Provide the error message and valid username properties for validation.[Index.razor] @page “/”@using System.ComponentModel.DataAnnotations <EditForm style=”width:470px;” Model=”_login” OnValidSubmit=”Submit”> <DataAnnotationsValidator /> <div class=”form-group row”> <label for=”name” class=”col-md-2 col-form-label”>Name:</label> <div class=”col-md-10″> <InputText id=”name” class=”form-control” @bind-Value=”_login.UserName” /> <ValidationMessage For=”@(() => _login.UserName)” /> </div> </div> <div class=”form-group row”> <label for=”supplier” class=”col-md-2 col-form-label”>Password:</label> <div class=”col-md-10″> <InputText id=”supplier” class=”form-control” @bind-Value=”_login.Password” /> <ValidationMessage For=”@(() => _login.Password)” /> </div> </div> <div class=”row”> <div class=”col-md-12 text-right”> <button type=”submit” class=”btn btn-success”>Submit</button> </div> </div> </EditForm> @code { private Login _login = new Login(); public void Submit() { Console.WriteLine($”User name is {_login.UserName} and password is {_login.Password}”); } public class Login { [Required] [CustomValidation(ErrorMessage = “The entered username is wrong “, ValidUserName = “admin”)] public string? UserName { get; set; } [Required] public string? Password { get; set; } } } Refer to the following output image for the custom validator.Refer to this link for more details. View Sample in GitHub
How do I install Blazor WebAssembly templates?
To get started with Blazor WebAssembly, install the latest version of the .NET Core SDK. The latest version of the .NET Core SDK installs the Blazor WebAssembly template by default. If you need to install the Blazor WebAssembly template manually, follow this documentation.
How do I check the framework version?
Using C# conditional preprocessor directives and predefined constants, you can check the Blazor target framework version. For example, if the framework targets .NET 6.0, or latest version the code is compiled only in that specified condition. Follow these steps to check the Blazor target framework version. [Index.razor]