.NET MVC 3自定义小数？模型绑定 [英] .NET MVC 3 Custom Decimal? Model Binder

问题描述

在我的模型中，我有以下小数？属性：

In my model, I have the following decimal? property:

public decimal? Budget { get; set; }

我意识到我需要小数其中哈克在以下链接提供的自定义模型绑定：<一href=\"http://haacked.com/archive/2011/03/19/fixing-binding-to-decimals.aspx\">http://haacked.com/archive/2011/03/19/fixing-binding-to-decimals.aspx.

我修改了code，这样，如果在传递的价值确实包含货币符号和/或逗号，然后我脱光，然后尝试将其转换为十进制。这工作，但被我的属性是可空小数类型，我也希望它什么都不接受，并沿其快乐的方式插入一个空到我的数据库列移动。现在它插入一个0.00元。我知道我错过了我的code的东西，但我有一个脑冻。

I have modified his code so that if the value being passed in does contain a currency symbol and/or comma then I strip it and then try to convert it to a decimal. This works but being that my property is a nullable decimal type, I also want it to accept nothing and move along its merry way inserting a null into that column in my database. Right now it inserts a 0.00. I know I'm missing something in my code but am having a brain freeze.

下面是粘合剂code：

Here's the binder code:

 public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
{
    ValueProviderResult valueResult = bindingContext.ValueProvider.GetValue(bindingContext.ModelName);
    ModelState modelState = new ModelState { Value = valueResult };
    object actualValue = null;
    object newValue = null;
    try
    {
        if (!string.IsNullOrEmpty(valueResult.AttemptedValue))
        {
            newValue = valueResult.AttemptedValue.Replace("$", "").Replace(",", "");
        }

        actualValue = Convert.ToDecimal(newValue, CultureInfo.CurrentCulture);
    }
    catch (FormatException e)
    {
        modelState.Errors.Add(e);
    }

    bindingContext.ModelState.Add(bindingContext.ModelName, modelState);
    return actualValue;
}

再次目标是有小数？行为与平常不同，但如果有其中包含一个货币符号和/或逗号一个值，它可以被转换为十进制然后返回

Again, the goal is to have decimal? act like it usually does but if there is a value which contains a currency symbol and/or comma and it can be converted to a decimal then to return that.

感谢

推荐答案

在try块，我认为你需要像

In the try block, I think you need something like

string valToCheck = valueResult.AttemptedValue;
if(valToCheck == string.Empty)
{
    actualValue = null;
}
else
{
    actualValue = Convert.ToDecimal(valToCheck.Replace("$", string.Empty), CultureInfo.InvariantCulture);
 }

在您的code，你总是设置actualValue到ToDecimal（）的结果。

In your code, you are always setting actualValue to the result of ToDecimal().

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