asp.net core自定义模型验证——前端验证
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官方网站:https://docs.microsoft.com/zh-cn/aspnet/core/mvc/models/validation?view=aspnetcore-2.1
首先派生自ValidationAttribute以及IClientModelValidator:
public class ClassicMovieAttribute : ValidationAttribute, IClientModelValidator { private int _year; public ClassicMovieAttribute(int Year) { _year = Year; } protected override ValidationResult IsValid(object value, ValidationContext validationContext) { Movie movie = (Movie)validationContext.ObjectInstance; if (movie.Genre == Genre.Classic && movie.ReleaseDate.Year > _year) { return new ValidationResult(GetErrorMessage()); } return ValidationResult.Success; } public void AddValidation(ClientModelValidationContext context) { if (context == null) { throw new ArgumentNullException(nameof(context)); } MergeAttribute(context.Attributes, "data-val", "true"); MergeAttribute(context.Attributes, "data-val-classicmovie", GetErrorMessage()); var year = _year.ToString(CultureInfo.InvariantCulture); MergeAttribute(context.Attributes, "data-val-classicmovie-year", year); } private bool MergeAttribute(IDictionary<string, string> attributes, string key, string value) { if (attributes.ContainsKey(key)) { return false; } attributes.Add(key, value); return true; } private string GetErrorMessage() { return $"Classic movies must have a release year earlier than {_year}."; } }
创建两个类:
创建两个类: public class Movie { public int Id { get; set; } [Required] [StringLength(100)] public string Title { get; set; } [ClassicMovie(1960)] [DataType(DataType.Date)] public DateTime ReleaseDate { get; set; } [Required] [StringLength(1000)] public string Description { get; set; } [Range(0, 999.99)] public decimal Price { get; set; } [Required] public Genre Genre { get; set; } public bool Preorder { get; set; } } public enum Genre { Classic, PostClassic, Modern, PostModern, Contemporary, }
视图方面:
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
<form asp-action="Create"> <div class="form-horizontal"> <h4>Movie</h4> <hr /> <div asp-validation-summary="ModelOnly" class="text-danger"></div> <div class="form-group"> <label asp-for="Title" class="col-md-2 control-label"></label> <div class="col-md-10"> <input asp-for="Title" class="form-control" /> <span asp-validation-for="Title" class="text-danger"></span> </div> </div> <div class="form-group"> <label asp-for="ReleaseDate" class="col-md-2 control-label"></label> <div class="col-md-10"> <input asp-for="ReleaseDate" class="form-control" /> <span asp-validation-for="ReleaseDate" class="text-danger"></span> </div> </div> <div class="form-group"> <label asp-for="Description" class="col-md-2 control-label"></label> <div class="col-md-10"> <input asp-for="Description" class="form-control" /> <span asp-validation-for="Description" class="text-danger"></span> </div> </div> <div class="form-group"> <label asp-for="Price" class="col-md-2 control-label"></label> <div class="col-md-10"> <input asp-for="Price" class="form-control" /> <span asp-validation-for="Price" class="text-danger"></span> </div> </div> <div class="form-group"> <label asp-for="Genre" class="col-md-2 control-label"></label> <div class="col-md-10"> <select asp-for="Genre" asp-items="@(Html.GetEnumSelectList<Genre>())" class="form-control"></select> <span asp-validation-for="Genre" class="text-danger"></span> </div> </div> <div class="form-group"> <div class="col-md-offset-2 col-md-10"> <div class="checkbox"> <input asp-for="Preorder" /> <label asp-for="Preorder"></label> </div> </div> </div> <div class="form-group"> <div class="col-md-offset-2 col-md-10"> <input type="submit" value="Create" class="btn btn-default" /> </div> </div> </div> </form> @section Scripts { @{await Html.RenderPartialAsync("_ValidationScriptsPartial");} <script type="text/javascript"> $(function () { $.validator.addMethod('classicmovie', function (value, element, params) { // Get element value. Classic genre has value '0'. var genre = $(params[0]).val(), year = params[1], date = new Date(value); if (genre && genre.length > 0 && genre[0] === '0') { // Since this is a classic movie, invalid if release date is after given year. return date.getFullYear() <= year; } return true; }); $.validator.unobtrusive.adapters.add('classicmovie', ['year'], function (options) { var element = $(options.form).find('select#Genre')[0]; options.rules['classicmovie'] = [element, parseInt(options.params['year'])]; options.messages['classicmovie'] = options.message; }); }); </script> } 然后创建一个Action: public IActionResult Index(Movie movie) { if(ModelState.isValid) { return Content("dsadas"); } return View(); }
然后创建一个Action:
public IActionResult Index(Movie movie) { if(ModelState.isValid) { return Content("dsadas"); } return View(); }
我们可以在qq浏览器中的查看页面源代码,会给我们生成:
<input class="form-control" type="datetime" data-val="true" data-val-classicmovie="Classic movies must have a release year earlier than 1960." data-val-classicmovie-year="1960" data-val-required="The ReleaseDate field is required." id="ReleaseDate" name="ReleaseDate" value="" />
也就是说,浏览器已经给我们解析好了,这样我们就可以一次比较,前后端验证。当然我们也可以使用bootstrapValidator验证。
转载请注明出处:http://www.cnblogs.com/zhiyong-ITNote/