自定义数据注解ASP

自定义数据注解ASP

本文介绍了自定义数据注解ASP.NET MVC C#的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我对MVC 2与C#的follwing问题。

I have the follwing question about MVC 2 with C#.

下面是我的模型:

public class Pmjob
{
   [Tooltext="Hier soll der Name eingegeben werden"]
   [DisplayName("Type")]
   public int Name { get; set; }
}

现在我想在我看来,电子到达Tooltext项目。 G:

Now I want to reach the Tooltext item in my view, e. g.:

@Html.ToolTextFor(Model => Model.Pmjob.Name)

或在BL:

if ( Model.Pmjob.Name.Tooltext == "") {
}

这可能吗?

推荐答案

创建一个抽象类MetaDataAttribute:

Create an abstract class MetaDataAttribute :

public abstract class MetadataAttribute : Attribute
{
    /// <summary>
    /// Method for processing custom attribute data.
    /// </summary>
    /// <param name="modelMetaData">A ModelMetaData instance.</param>
    public abstract void Process(ModelMetadata modelMetaData);
}

请您从属性继承MetaDataAttribute:

Make your attribute inherit from MetaDataAttribute :

public class ToolTextAttribute : MetadataAttribute
{
    public string Text { get; set; }
    public TooltextAttribute(string text)
    {
        this.Text = new text;
    }

    public override void Process(ModelMetadata modelMetaData)
    {
        modelMetaData.AdditionalValues.Add("ToolText", this.Text);
    }
}

创建自定义MetaDataProvider:

Create the custom MetaDataProvider :

public class CustomModelMetadataProvider : DataAnnotationsModelMetadataProvider
{
    protected override ModelMetadata CreateMetadata(
        IEnumerable<Attribute> attributes,
        Type containerType,
        Func<object> modelAccessor,
        Type modelType,
        string propertyName)
    {
        var modelMetadata = base.CreateMetadata(attributes, containerType, modelAccessor, modelType, propertyName);
        attributes.OfType<MetadataAttribute>().ToList().ForEach(x => x.Process(modelMetadata));
        return modelMetadata;
    }
}

和替代默认的(的global.asax.cs):

And replace the default one (global.asax.cs) :

protected void Application_Start()
{
    // snipped

    ModelMetadataProviders.Current = new CustomModelMetadataProvider();
}

最后,您可以在您的视图访问(或在HTML辅助):

Finally, you can access it in your view (or in a Html Helper ) :

(string)ViewData.ModelMetadata.AdditionalValues.Where(x => x.Key == "ToolText").SingleOrDefault()

来源:




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09-02 13:03