asp.net core自定义模型验证——前端验证
导读：转载请注明出处：http://www.cnblogs.com/zhiyong-ITNote/官方网站：https://docs.microsoft.com/zh-cn/aspnet/core/mvc/models/validation?vi...
转载请注明出处：http://www.cnblogs.com/zhiyong-ITNote/
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(IDictionarystring, 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：
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.GetEnumSelectListGenre>
())" 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。
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