C# 布尔值、字符串和文件上载的RequiredIf验证属性

有人可以给我写一个验证属性的示例，该属性验证一个依赖字段，该字段可以是布尔值、字符串或HttpPostedFile值。我一直在寻找，但我尝试过的例子并不适用于所有这些情况。e、 或者，如果你能找出为什么我的页面在验证后没有提交-这是一个例子的链接

例如，1如果UserReferenceID为false，则使用部门图像

public bool UserReferenceId { get; set; }

[RequiredIf("UseReferenceId", false, ErrorMessage="Error please select a Advert image")]
public HttpPostedFileBase DepartmentImageFile { get; set; }

例2

我一直在使用这段代码，但我的页面在验证完成后不会提交

data-val-requiredif="Url is required for advertisement url." 
data-val-requiredif-dependentproperty="UseReferenceId" data-val-requiredif-targetvalue="false"

public class RequiredIfAttribute : ValidationAttribute, IClientValidatable
{
    protected RequiredAttribute _innerAttribute;

    public string DependentProperty { get; set; }
    public object TargetValue { get; set; }

    public bool AllowEmptyStrings
    {
        get
        {
            return _innerAttribute.AllowEmptyStrings;
        }
        set
        {
            _innerAttribute.AllowEmptyStrings = value;
        }
    }

    public RequiredIfAttribute(string dependentProperty, object targetValue)
    {
        _innerAttribute = new RequiredAttribute();
        DependentProperty = dependentProperty;
        TargetValue = targetValue;
    }

    protected override ValidationResult IsValid(object value, ValidationContext validationContext)
    {
        // get a reference to the property this validation depends upon
        var containerType = validationContext.ObjectInstance.GetType();
        var field = containerType.GetProperty(DependentProperty);

        if (field != null)
        {
            // get the value of the dependent property
            var dependentValue = field.GetValue(validationContext.ObjectInstance, null);
            // trim spaces of dependent value
            if (dependentValue != null && dependentValue is string)
            {
                dependentValue = (dependentValue as string).Trim();

                if (!AllowEmptyStrings && (dependentValue as string).Length == 0)
                {
                    dependentValue = null;
                }
            }

            // compare the value against the target value
            if ((dependentValue == null && TargetValue == null) ||
                (dependentValue != null && (TargetValue.Equals("*") || dependentValue.Equals(TargetValue))))
            {
                // match => means we should try validating this field
                if (!_innerAttribute.IsValid(value))
                    // validation failed - return an error
                    return new ValidationResult(FormatErrorMessage(validationContext.DisplayName), new[] { validationContext.MemberName });
            }
        }

        return ValidationResult.Success;
    }

    public virtual IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context)
    {
        var rule = new ModelClientValidationRule
        {
            ErrorMessage = FormatErrorMessage(metadata.GetDisplayName()),
            ValidationType = "requiredif",
        };

        string depProp = BuildDependentPropertyId(metadata, context as ViewContext);

        // find the value on the control we depend on;
        // if it's a bool, format it javascript style 
        // (the default is True or False!)
        string targetValue = (TargetValue ?? "").ToString();
        if (TargetValue is bool)
            targetValue = targetValue.ToLower();

        rule.ValidationParameters.Add("dependentproperty", depProp);
        rule.ValidationParameters.Add("targetvalue", targetValue);

        yield return rule;
    }

    private string BuildDependentPropertyId(ModelMetadata metadata, ViewContext viewContext)
    {
        // build the ID of the property
        string depProp = viewContext.ViewData.TemplateInfo.GetFullHtmlFieldId(DependentProperty);
        // unfortunately this will have the name of the current field appended to the beginning,
        // because the TemplateInfo's context has had this fieldname appended to it. Instead, we
        // want to get the context as though it was one level higher (i.e. outside the current property,
        // which is the containing object, and hence the same level as the dependent property.
        var thisField = metadata.PropertyName + "_";
        if (depProp.StartsWith(thisField))
            // strip it off again
            depProp = depProp.Substring(thisField.Length);
        return depProp;
    }
}

data val requiredif=“广告Url需要Url。”
数据值requiredif dependentproperty=“UserReferenceId”数据值requiredif targetvalue=“false”
公共类requireditAttribute:ValidationAttribute，IClientValidable
{
受保护的RequiredAttribute\u innerAttribute；
公共字符串依赖属性{get；set；}
公共对象TargetValue{get；set；}
公共场所允许吸烟
{
收到
{
返回_innerAttribute.AllowEmptyStrings；
}
设置
{
_innerAttribute.AllowEmptyStrings=值；
}
}
public requirediftAttribute（字符串相关属性，对象targetValue）
{
_innerAttribute=新的RequiredAttribute（）；
DependentProperty=DependentProperty；
TargetValue=TargetValue；
}
受保护的重写ValidationResult有效（对象值，ValidationContext ValidationContext）
{
//获取对此验证所依赖的属性的引用
var containerType=validationContext.ObjectInstance.GetType（）；
var field=containerType.GetProperty（DependentProperty）；
如果（字段！=null）
{
//获取依赖属性的值
var dependentValue=field.GetValue（validationContext.ObjectInstance，null）；
//从属值的修剪空间
if（dependentValue！=null&&dependentValue为字符串）
{
dependentValue=（dependentValue作为字符串）.Trim（）；
如果（！AllowEmptyStrings&&（dependentValue作为字符串）。长度==0）
{
dependentValue=null；
}
}
//将该值与目标值进行比较
if（（dependentValue==null&&TargetValue==null）||
（dependentValue！=null&（TargetValue.Equals（“*”）| | dependentValue.Equals（TargetValue）））
{
//match=>表示我们应该尝试验证此字段
如果（！\u innerAttribute.IsValid（值））
//验证失败-返回错误
返回新的ValidationResult（FormatErrorMessage（validationContext.DisplayName），new[]{validationContext.MemberName}）；
}
}
返回ValidationResult.Success；
}
公共虚拟IEnumerable GetClientValidationRules（ModelMetadata元数据、ControllerContext上下文）
{
var规则=新ModelClientValidationRule
{
ErrorMessage=FormatErrorMessage（metadata.GetDisplayName（）），
ValidationType=“requiredif”，
};
string depProp=BuildDependentPropertyId（元数据，上下文为ViewContext）；
//找到我们所依赖的控件的值；
//如果是bool，则将其格式化为javascript样式
//（默认值为True或False！）
字符串targetValue=（targetValue？？）.ToString（）；
如果（目标值为布尔）
targetValue=targetValue.ToLower（）；
rule.ValidationParameters.Add（“dependentproperty”，depProp）；
规则.ValidationParameters.Add（“targetvalue”，targetvalue）；
收益率-收益率规则；
}
私有字符串BuildDependentPropertyId（ModelMetadata元数据，ViewContext）
{
//生成属性的ID
string depProp=viewContext.ViewData.TemplateInfo.GetFullHtmlFieldDid（DependentProperty）；
//不幸的是，这将在开头追加当前字段的名称，
//因为TemplateInfo的上下文已经附加了这个字段名
//想要获得更高一级的上下文（即在当前属性之外，
//它是包含对象，因此与从属属性处于同一级别。
var thisField=metadata.PropertyName+“\uux”；
if（depProp.StartsWith（此字段））
//再把它剥掉
depProp=depProp.Substring（thisField.Length）；
返回depProp；
}
}

您是否考虑过每个用例都有一个ValidationAttribute？是的，我一直在学习一个教程，但在验证完成后页面不会提交

data-val-requiredif="Url is required for advertisement url." 
data-val-requiredif-dependentproperty="UseReferenceId" data-val-requiredif-targetvalue="false"

public class RequiredIfAttribute : ValidationAttribute, IClientValidatable
{
    protected RequiredAttribute _innerAttribute;

    public string DependentProperty { get; set; }
    public object TargetValue { get; set; }

    public bool AllowEmptyStrings
    {
        get
        {
            return _innerAttribute.AllowEmptyStrings;
        }
        set
        {
            _innerAttribute.AllowEmptyStrings = value;
        }
    }

    public RequiredIfAttribute(string dependentProperty, object targetValue)
    {
        _innerAttribute = new RequiredAttribute();
        DependentProperty = dependentProperty;
        TargetValue = targetValue;
    }

    protected override ValidationResult IsValid(object value, ValidationContext validationContext)
    {
        // get a reference to the property this validation depends upon
        var containerType = validationContext.ObjectInstance.GetType();
        var field = containerType.GetProperty(DependentProperty);

        if (field != null)
        {
            // get the value of the dependent property
            var dependentValue = field.GetValue(validationContext.ObjectInstance, null);
            // trim spaces of dependent value
            if (dependentValue != null && dependentValue is string)
            {
                dependentValue = (dependentValue as string).Trim();

                if (!AllowEmptyStrings && (dependentValue as string).Length == 0)
                {
                    dependentValue = null;
                }
            }

            // compare the value against the target value
            if ((dependentValue == null && TargetValue == null) ||
                (dependentValue != null && (TargetValue.Equals("*") || dependentValue.Equals(TargetValue))))
            {
                // match => means we should try validating this field
                if (!_innerAttribute.IsValid(value))
                    // validation failed - return an error
                    return new ValidationResult(FormatErrorMessage(validationContext.DisplayName), new[] { validationContext.MemberName });
            }
        }

        return ValidationResult.Success;
    }

    public virtual IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context)
    {
        var rule = new ModelClientValidationRule
        {
            ErrorMessage = FormatErrorMessage(metadata.GetDisplayName()),
            ValidationType = "requiredif",
        };

        string depProp = BuildDependentPropertyId(metadata, context as ViewContext);

        // find the value on the control we depend on;
        // if it's a bool, format it javascript style 
        // (the default is True or False!)
        string targetValue = (TargetValue ?? "").ToString();
        if (TargetValue is bool)
            targetValue = targetValue.ToLower();

        rule.ValidationParameters.Add("dependentproperty", depProp);
        rule.ValidationParameters.Add("targetvalue", targetValue);

        yield return rule;
    }

    private string BuildDependentPropertyId(ModelMetadata metadata, ViewContext viewContext)
    {
        // build the ID of the property
        string depProp = viewContext.ViewData.TemplateInfo.GetFullHtmlFieldId(DependentProperty);
        // unfortunately this will have the name of the current field appended to the beginning,
        // because the TemplateInfo's context has had this fieldname appended to it. Instead, we
        // want to get the context as though it was one level higher (i.e. outside the current property,
        // which is the containing object, and hence the same level as the dependent property.
        var thisField = metadata.PropertyName + "_";
        if (depProp.StartsWith(thisField))
            // strip it off again
            depProp = depProp.Substring(thisField.Length);
        return depProp;
    }
}