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c# nullable double 通过氟网关到actionscript NaN

发布于 2024-09-15 15:06:12 字数 210 浏览 13 评论 0原文

氟中是否有办法强制将可空双精度值作为 NaN 传递给 flex ？（反之亦然）默认情况下，这些值作为 null 传递，但 actionscript 中的 Number 不可为 null，因此默认情况下将其转换为 0。

我需要服务器端可空双精度数在 Flex 中为 NaN，并且 Flex 中的 NaN 值在服务器端为可空双精度数。

有什么想法吗？

谢谢，

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孤千羽 2024-09-22 15:06:12

我不知道氟，但我想你可以传入：

  (myDouble ?? Double.NaN)

This expression is of type double, not double?, and it will be NaN if <代码>myDouble 为null。

I don't know Fluorine, but I'd imagine that you could pass in:

  (myDouble ?? Double.NaN)

This expression is of type double, not double?, and it will be NaN if myDouble was null.

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素手挽清风 2024-09-22 15:06:12

我们刚刚遇到了同样的问题。我们的解决方案是修改 Fluorine 代码来编写对象。

在文件 AMFWriter 的 1367 行中，在调用 WriteAMF3Data(memberValue) 之前，我添加了以下代码：

//Mapping null double?s to NaN when writing data.
if (memberValue == null)
{
    System.Reflection.PropertyInfo p = type.GetProperty(classMember.Name);
    if (p != null)
    {
        Type t = p.PropertyType; // t will be System.String
        if (t.IsEquivalentTo(typeof(Nullable<Double>)))
            memberValue = Double.NaN;
    }
}

到目前为止，它似乎有效。但是，我通常不使用 .NET 编写代码，因此可能有更好的方法来执行此操作。

We just had the same problem. Our solution was to modify the Fluorine code for writing objects.

In the file AMFWriter, line 1367, right before calling WriteAMF3Data(memberValue) I added the following code:

//Mapping null double?s to NaN when writing data.
if (memberValue == null)
{
    System.Reflection.PropertyInfo p = type.GetProperty(classMember.Name);
    if (p != null)
    {
        Type t = p.PropertyType; // t will be System.String
        if (t.IsEquivalentTo(typeof(Nullable<Double>)))
            memberValue = Double.NaN;
    }
}

It seems to work so far. But, I don't usually code in .NET, so there might be a better way of doing this.

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遗失的美好 2024-09-22 15:06:12

看起来 fluine 有一个配置部分，它定义了如何转换可空值。我还没有测试过。

复制自

FluorineFx.NET  
Null values
The <nullable> configuration section allows the use of special value of the given value type as the null value. 

Use this solution only when you can identify a value which is unused.

<nullable>
    <type name="System.Int32" assembly="MinValue"/>
    <type name="System.Double" assembly="MinValue"/>
    <type name="System.DateTime" assembly="MinValue"/>
    <type name="System.Guid" assembly="Empty"/>
</nullable>

The name attribute is the fully qualified type name, the value attribute is a static member of the type (such as "MinValue") or a parseable value (0 for System.Int32 for example).

The acceptNullValueTypes option
Fluorine will accept null values sent from client for value-types if configured accordingly

    <acceptNullValueTypes>false</acceptNullValueTypes>

If acceptNullValueTypes = true (the default is false if not specified) any value-type that is not explicitly initialized with a value will contain the default value for that object type (0 for numeric types, false for Boolean, DateTime.Min for DateTime)

It looks like fluorine has a config section which defines how nullables are converted. I haven't tested it yet.

Copied from
http://www.fluorinefx.com/docs/fluorine/nullable.html

FluorineFx.NET  
Null values
The <nullable> configuration section allows the use of special value of the given value type as the null value. 

Use this solution only when you can identify a value which is unused.

<nullable>
    <type name="System.Int32" assembly="MinValue"/>
    <type name="System.Double" assembly="MinValue"/>
    <type name="System.DateTime" assembly="MinValue"/>
    <type name="System.Guid" assembly="Empty"/>
</nullable>

The name attribute is the fully qualified type name, the value attribute is a static member of the type (such as "MinValue") or a parseable value (0 for System.Int32 for example).

The acceptNullValueTypes option
Fluorine will accept null values sent from client for value-types if configured accordingly

    <acceptNullValueTypes>false</acceptNullValueTypes>

If acceptNullValueTypes = true (the default is false if not specified) any value-type that is not explicitly initialized with a value will contain the default value for that object type (0 for numeric types, false for Boolean, DateTime.Min for DateTime)

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