1. 首先安装 FluentValidation.AspNetCore 包

2. 在 Startup.cs 文件中添加以下代码：

using FluentValidation;

public class YourValidator : AbstractValidator { public YourValidator() { RuleFor(x => x.PropertyName).NotNull().WithMessage("Error Message"); // Add other validation rules here } }

public class Startup { public void ConfigureServices(IServiceCollection services) { // Register your validator with DI services.AddTransient, YourValidator>(); }

public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
    // Use FluentValidation middleware
    app.UseFluentValidation();

    // Add other middleware here
}

}

3. 在控制器中使用验证器

public class YourController : Controller { private readonly IValidator _validator;

public YourController(IValidator validator)
{
    _validator = validator;
}

[HttpPost]
public IActionResult YourAction(YourModel model)
{
    // Validate your model
    var validationResult = _validator.Validate(model);

    if (!validationResult.IsValid)
    {
        // Handle validation errors
        foreach (var error in validationResult.Errors)
        {
            ModelState.AddModelError(error.PropertyName, error.ErrorMessage);
        }

        return View(model);
    }

    // Your code logic here
    return Redirect("/");
}

}