If your Windows 11 taskbar is not showing, you can try several troubleshooting steps to resolve the issue. Here are some potential solutions you can try:
In Blazor, you can perform validation using both client-side and server-side approaches. Client-side validation allows you to validate user input without making a round trip to the server, while server-side validation ensures that the data submitted by the client is valid on the server. Here's an overview of how you can perform validation in Blazor:
- Client-Side Validation:
- Start by adding the
System.ComponentModel.DataAnnotations
namespace to your component file. - Define validation rules using attributes such as
[Required]
,[Range]
,[RegularExpression]
, etc., on the properties of your model class. - In your Blazor component, bind the input fields to the corresponding properties of your model using the
@bind
directive. - To display validation error messages, use the
ValidationMessage
component and bind it to the property you want to validate. - You can also use the
EditForm
component to encapsulate your input fields and handle form submission. - When the user submits the form, the client-side validation will be triggered, and any validation errors will be displayed.
- Start by adding the
Here's an example of client-side validation in Blazor:
// MyModel.cs
public class MyModel
{
[Required(ErrorMessage = "Name is required.")]
public string Name { get; set; }
[Range(18, 99, ErrorMessage = "Age must be between 18 and 99.")]
public int Age { get; set; }
}
// MyComponent.razor
<EditForm Model="@model" OnValidSubmit="HandleSubmit">
<div>
<label>Name:</label>
<InputText @bind-Value="model.Name" />
<ValidationMessage For="@(() => model.Name)" />
<label>Age:</label>
<InputNumber @bind-Value="model.Age" />
<ValidationMessage For="@(() => model.Age)" />
</div>
<button type="submit">Submit</button>
</EditForm>
@code {
private MyModel model = new MyModel();
private void HandleSubmit()
{
// Perform form submission logic
}
}
- Server-Side Validation:
- Define validation rules on the server-side by implementing the
IValidatableObject
interface in your model class. - Implement the
Validate
method and add your custom validation logic. - When the user submits the form, the server-side validation will be triggered, and any validation errors will be returned to the client.
- Define validation rules on the server-side by implementing the
Here's an example of server-side validation in Blazor:
// MyModel.cs
public class MyModel : IValidatableObject
{
public string Name { get; set; }
public int Age { get; set; }
public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
{
var results = new List<ValidationResult>();
if (string.IsNullOrEmpty(Name))
results.Add(new ValidationResult("Name is required.", new[] { nameof(Name) }));
if (Age < 18 || Age > 99)
results.Add(new ValidationResult("Age must be between 18 and 99.", new[] { nameof(Age) }));
return results;
}
}
// MyComponent.razor
<!-- Same as previous example -->
@code {
private MyModel model = new MyModel();
private void HandleSubmit()
{
var validationResults = model.Validate(new ValidationContext(model));
if (validationResults.Any())
{
// Handle validation errors
}
else
{
// Perform form submission logic
}
}
}
By combining client-side and server-side validation, you can ensure that user input is validated both on the client and the server, providing a robust validation mechanism in your Blazor applications.
Comments
Post a Comment