手把手教你AspNetCore WebApi数据验证的实现_实用技巧_

 [HttpPost] public async Task> PostTodo(Todo todo) { if (string.IsNullOrEmpty(todo.Name)) { return Ok("名称不能为空"); } context.Todo.Add(todo); await context.SaveChangesAsync(); return CreatedAtAction("GetTodo", new { id = todo.Id }, todo); } 

 namespace App001.Models { /// 
 /// 待办事项 /// 
 public class Todo { /// 
 /// ID /// 
 public Guid Id { get; set; } /// 
 /// 名称 /// 
 [Required(ErrorMessage = "名称不能为空")] public string Name { get; set; } } } 

 { "type": "https://tools.ietf.org/html/rfc7231#section-6.5.1", "title": "One or more validation errors occurred.", "status": 400, "traceId": "|df184e36-4e11844dfd38a626.", "errors": { "Name": [ "名称不能为空" ] } } 

 [Required(ErrorMessage = "名称不能为空")]

 public class ModelValidateActionFilterAttribute : ActionFilterAttribute { public override void OnActionExecuting(ActionExecutingContext context) { if (!context.ModelState.IsValid) { //获取验证失败的模型字段 var errors = context.ModelState .Where(e => e.Value.Errors.Count > 0) .Select(e => e.Value.Errors.First().ErrorMessage) .ToList(); var str = string.Join("|", errors); //设置返回内容 var result = new { Code = 10000, Msg = "未通过数据验证。", FullMsg = str }; context.Result = new BadRequestObjectResult(result); } } } 

 //关闭默认模型验证 services.Configure(opt => opt.SuppressModelStateInvalidFilter = true); services.AddControllers(opt => { //添加过滤器 opt.Filters.Add(typeof(ModelValidateActionFilterAttribute)); }).AddNewtonsoftJson(opt => { //json字符串大小写原样输出 opt.SerializerSettings.ContractResolver = new DefaultContractResolver(); }); 

 { "Code": 10000, "Msg": "未通过数据验证。", "FullMsg": "名称不能为空。" } 

 services.Configure(opt => { opt.InvalidModelStateResponseFactory = actionContext => { //获取验证失败的模型字段 var errors = actionContext.ModelState .Where(e => e.Value.Errors.Count > 0) .Select(e => e.Value.Errors.First().ErrorMessage) .ToList(); var str = string.Join("|", errors); //设置返回内容 var result = new { Code = 10000, Msg = "未通过数据验证。", FullMsg = str }; return new BadRequestObjectResult(result); }; });