ValueProvider.GetValue 扩展方法

发布于 2024-08-29 13:52:03 字数 1300 浏览 6 评论 0原文

我有一个这样的模型；

public class QuickQuote
{
    [Required]
    public Enumerations.AUSTRALIA_STATES  state { get; set; }

    [Required]
    public Enumerations.FAMILY_TYPE familyType { get; set; }

正如你所看到的，这两个属性是枚举。

现在我想使用我自己的模型绑定器，因为我现在不想费心去了解。

所以我有；

public class QuickQuoteBinder : DefaultModelBinder
{

    public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
    {
        quickQuote = new QuickQuote();

        try
        {
            quickQuote.state = (Enumerations.AUSTRALIA_STATES)
                Enum.Parse(typeof(Enumerations.AUSTRALIA_STATES),
                bindingContext.ValueProvider.GetValue(bindingContext.ModelName + ".state").AttemptedValue);
        }
        catch {
            ModelState modelState = new ModelState();
            ModelError err = new ModelError("Required");
            modelState.Errors.Add(err);
            bindingContext.ModelState.Add(bindingContext.ModelName + ".state", modelState);
        }

问题是，对于每个属性，并且有堆，我需要执行整个 try catch 块。

我想我可能会做的是创建一个扩展方法，它可以为我完成整个块，我需要传入的是模型属性和枚举。

所以我可以做类似的事情；

quickQuote.state = bindingContext.ValueProvider.GetModelValue("state", ...) 等。

这可能吗？

原文

I have a model like this;

public class QuickQuote
{
    [Required]
    public Enumerations.AUSTRALIA_STATES  state { get; set; }

    [Required]
    public Enumerations.FAMILY_TYPE familyType { get; set; }

As you can see the two proerties are enumerations.

Now I want to employ my own model binder for reasons that I won't bother getting into at the moment.

So I have;

public class QuickQuoteBinder : DefaultModelBinder
{

    public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
    {
        quickQuote = new QuickQuote();

        try
        {
            quickQuote.state = (Enumerations.AUSTRALIA_STATES)
                Enum.Parse(typeof(Enumerations.AUSTRALIA_STATES),
                bindingContext.ValueProvider.GetValue(bindingContext.ModelName + ".state").AttemptedValue);
        }
        catch {
            ModelState modelState = new ModelState();
            ModelError err = new ModelError("Required");
            modelState.Errors.Add(err);
            bindingContext.ModelState.Add(bindingContext.ModelName + ".state", modelState);
        }

The problem is that for each property, and there are heaps, I need to do the whole try catch block.

What I thought I might do is create an extension method which would do the whole block for me and all i'd need to pass in is the model property and the enumeration.

So I could do something like;

quickQuote.state = bindingContext.ValueProvider.GetModelValue("state", ...) etc.

Is this possible?

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我早已燃尽 2024-09-05 13:52:03

是的，你可以有一个扩展方法。这是一个非常简单的示例，展示了如何编写它。

public static class Extensions
{
    public static ValueProviderResult GetModel(this IValueProvider valueProvider, string key)
    {
        return valueProvider.GetValue(key);

    }
}

我要考虑的另一件事是使用 Enum.IsDefined 而不是 try catch 块。它将提高性能并可能产生更具可读性的代码。

Yes you can have an extension method. Here's a very simple example to show how you'd write it.

public static class Extensions
{
    public static ValueProviderResult GetModel(this IValueProvider valueProvider, string key)
    {
        return valueProvider.GetValue(key);

    }
}

The other thing I'd consider is to use Enum.IsDefined rather than a try catch block. It will improve performance and probably result in more readable code.

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仅此而已 2024-09-05 13:52:03

好的，我明白了。

public static class TryGetValueHelper
{
    public static TEnum TryGetValue<TEnum>(this ModelBindingContext context, string property)
    {
        try
        {
            TEnum propertyValue = (TEnum)Enum.Parse(typeof(TEnum), context.ValueProvider.GetValue(property).AttemptedValue);
            return propertyValue;
        }
        catch {
            ModelState modelState = new ModelState();
            ModelError modelError = new ModelError("Required");
            modelState.Errors.Add(modelError);
            context.ModelState.Add(context.ModelName + "." + property, modelState);
        }

        return default(TEnum);

    }
}

's ok, I got it.

public static class TryGetValueHelper
{
    public static TEnum TryGetValue<TEnum>(this ModelBindingContext context, string property)
    {
        try
        {
            TEnum propertyValue = (TEnum)Enum.Parse(typeof(TEnum), context.ValueProvider.GetValue(property).AttemptedValue);
            return propertyValue;
        }
        catch {
            ModelState modelState = new ModelState();
            ModelError modelError = new ModelError("Required");
            modelState.Errors.Add(modelError);
            context.ModelState.Add(context.ModelName + "." + property, modelState);
        }

        return default(TEnum);

    }
}

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