ASP.Net Core MVC 自定义属性的客户端验证

IClient型号Validator实际上是正确的接口.我在下面做了一个精心设计的示例实现.

Note: RC1和RC2之间的IClient型号Validator接口有一个breaking change.这两个选项如下所示-代码的睡觉在两个版本之间是相同的.

属性(RC2及更高版本)

[AttributeUsage(AttributeTargets.Property, AllowMultiple = false, Inherited = false)]
public sealed class CannotBeRedAttribute : ValidationAttribute, IClient型号Validator
{
    public override bool IsValid(object value)
    {
        var message = value as string;
        return message?.ToUpper() == "RED";
    }

    public void AddValidation(Client型号ValidationContext context)
    {
        MergeAttribute(context.Attributes, "data-val", "true");
        var errorMessage = FormatErrorMessage(context.型号Metadata.GetDisplayName());
        MergeAttribute(context.Attributes, "data-val-cannotbered", errorMessage);
    }

    private bool MergeAttribute(
        IDictionary<string, string> attributes,
        string key,
        string value)
    {
        if (attributes.ContainsKey(key))
        {
            return false;
        }
        attributes.Add(key, value);
        return true;
    }
}

属性(RC1)

[AttributeUsage(AttributeTargets.Property, AllowMultiple = false, Inherited = false)]
public sealed class CannotBeRedAttribute : ValidationAttribute, IClient型号Validator
{
    public override bool IsValid(object value)
    {
        var message = value as string;
        return message?.ToUpper() == "RED";
    }

    public IEnumerable<型号ClientValidationRule> GetClientValidationRules(
        Client型号ValidationContext context)
    {
        yield return new 型号ClientValidationRule(
            "cannotbered",
            FormatErrorMessage(ErrorMessage));
    }
}

型号

public class Contact型号
{
    [CannotBeRed(ErrorMessage = "Red is not allowed!")]
    public string Message { get; set; }
}

看法

@model WebApplication22.型号s.Contact型号

<form asp-action="Contact" method="post">
    <label asp-for="Message"></label>
    <input asp-for="Message" />
    <span asp-validation-for="Message"></span>
    <input type="submit" value="Save" />
</form>

@section scripts {
    <script src="~/lib/jquery-validation/dist/jquery.validate.min.js"></script>
    <script src="~/lib/jquery-validation-unobtrusive/jquery.validate.unobtrusive.min.js"></script>
    <script>
        $.validator.addMethod("cannotbered",
            function (value, element, parameters) {
                return value.toUpperCase() !== "RED";
            });

        $.validator.unobtrusive.adapters.add("cannotbered", [], function (options) {
            options.rules.cannotbered = {};
            options.messages["cannotbered"] = options.message;
        });
    </script>
}