Asp.net Web Api -验证属性被调用两次

本文关键字：调用 两次 属性 Web net Api 验证 Asp | 更新日期: 2023-09-27 18:04:39

我定义了一个从ValidationAttribute派生的新属性。例如

[AttributeUsage(AttributeTargets.Property, AllowMultiple = false)]
    public class ValidateDataAttribute : ValidationAttribute
    {
        public override bool IsValid(object value)
        {
            // some logic
            return true;
        }
    }

我面临的问题是"IsValid"方法被调用两次，对于给定的Post/Put请求。在无效ModelState的情况下，这会导致错误消息的重复。你知道会出什么问题吗?

示例用法:

public class Test
    {
        [Required]
        [ValidateData]
        public string Data {get;set;}
    }

Asp.net Web Api -验证属性被调用两次

您已经添加了[Required]和[ValidateData]属性。

我想这应该工作得很好，如果你删除所需的属性，因为它做同样的事情。两者都继承自ValidateAttribute

public class Test { [Required] public string Data {get;set;} }

请查看所需的属性类

   // Summary:
//     Specifies that a data field value is required.
[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter, AllowMultiple = false)]
public class RequiredAttribute : ValidationAttribute
{
    // Summary:
    //     Initializes a new instance of the System.ComponentModel.DataAnnotations.RequiredAttribute
    //     class.
    public RequiredAttribute();
    // Summary:
    //     Gets or sets a value that indicates whether an empty string is allowed.
    //
    // Returns:
    //     true if an empty string is allowed; otherwise, false. The default value is
    //     false.
    public bool AllowEmptyStrings { get; set; }
    // Summary:
    //     Checks that the value of the required data field is not empty.
    //
    // Parameters:
    //   value:
    //     The data field value to validate.
    //
    // Returns:
    //     true if validation is successful; otherwise, false.
    //
    // Exceptions:
    //   System.ComponentModel.DataAnnotations.ValidationException:
    //     The data field value was null.
    public override bool IsValid(object value);
}
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