I am trying to cast a list to a type, but I am having issues on the following line:

value = isArray ? ((List<object>)value).ToArray() : value;

I am get,c#,unity3d"/>

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首页 > 解决方案 > 如何将对象转换为列表 and turn it into an array?

I am trying to cast a list to a type, but I am having issues on the following line:

value = isArray ? ((List<object>)value).ToArray() : value;

I am get

c# - 如何将对象转换为列表 and turn it into an array?

I am trying to cast a list to a type, but I am having issues on the following line:

value = isArray ? ((List<object>)value).ToArray() : value;

I am get

问题描述

I am trying to cast a list to a type, but I am having issues on the following line:

value = isArray ? ((List<object>)value).ToArray() : value;

I am getting an error saying that it cannot cast from source type to destination type. However, If I change List<object> to List<int> it works. I cannot do that due to the fact that the list most likely won't be an int every time since it is dynamic.

Is there an Invoke or something that I can do to pass a type as a parameter to say that invoke will return List<x> (where x is some sort of dynamic type)?

var castMethod = this.GetType().GetMethod("CastList").MakeGenericMethod(type);
value = castMethod.Invoke(null, new object[] { value });
value = isArray ? ((List<object>)value).ToArray() : value;

public static List<T> CastList<T>(List<object> o) {
    var list = new List<T>();
    foreach (var i in o) { list.Add((T)i); }
    return list;
}

In the end the value of value will be either a List or an Array.

Edit

Here is the full method:

void SaveDataLocal() {
    keyValues.ForEach(item => {
        var field = GameData.save.GetType().GetField(item.key);
        var value = GetValue(item);
        var isArray = field.FieldType.IsArray;
        var isList = IsList(value);

        // Convert arrays to proper types
        if (isArray || isList) {
            Type type;
            // Get the array type
            if (isArray) type = field.FieldType.GetElementType();
            // Get the list type
            else type = field.FieldType.GetGenericArguments().Single();
            // Do the cast
            var castMethod = this.GetType().GetMethod("CastList").MakeGenericMethod(type);
            value = castMethod.Invoke(null, new object[] { value });
            value = isArray ? ((List<object>)value).ToArray() : value;
        }

        field.SetValue(GameData.save, value);
    });
    GameData.Save();
}

Here is my key/value object:

class KeyValue {
    public string key;
    public object value;

    public KeyValue(string key, object value) {
        this.key = key;
        this.value = value;
    }
}

Heroku Ruby supported versions not in rbenv

My app is currently using the gem ruby '1.9.3'. Heroku won't let me update the app.

They list the following as supported Ruby versions:

  • 2.4.5 : patchlevel 335, Rubygems: 2.6.14.3

  • 2.5.3: patchlevel 105, Rubygems: 2.7.6

  • 2.6.1: patchlevel 33, Rubygems: 3.0.1

I'm using Rbenv to manage ruby versions. If I run $ rbenv install --list, none of those (2.4.5, 2.5.3, 2.6.1) are in the listed versions available.

What can I do?

标签： c#unity3d

解决方案

看来您实际上并不需要List<>. 你只需要一个IEnumerable<>.

(IEnumerable<object>)value).ToArray()

为什么这行得通而List<>没有？因为anIEnumerable<int> 是IEnumerable<object>. 但是 aList<int>不是a ，如果是的话，你可以说。List<object>.Add(new Object())List<int>

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