在 C# 中转换对象引用

发布于 2024-10-23 18:39:10 字数 344 浏览 2 评论 0原文

如果我有一个函数引用一个对象。如何转换参数以避免类型不匹配？

Dictionary<string, string> mySettings = new Dictionary<string, string>();
.
.
saveSettings(ref mySettings);
.
.
void saveSettings(ref object)
{
}

对 saveSettings 的调用会导致以下错误消息：

无法从“ref Dictionary”转换为“ref object”

我不是在寻找解决方法，我已经这样做了，我想知道这种直接方法是否可行。

原文

If I have a function that takes a reference to an object. How do I cast the parameter to avoid a type mismatch?

Dictionary<string, string> mySettings = new Dictionary<string, string>();
.
.
saveSettings(ref mySettings);
.
.
void saveSettings(ref object)
{
}

The call to saveSettings results in the following error message:

cannot convert from 'ref Dictionary' to 'ref object'

I'm not looking for a workaround, I've done that, I would like to know if this direct approach is possible.

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那些过往 2024-10-30 18:39:10

如果保存设置采用多种类型，为什么不使用通用类型呢？特别是如果它们共享一个通用接口。

void saveSettings<T>(T obj);

If save settings is taking multiple types, why not use a generic instead? Esp if they share a common interface.

void saveSettings<T>(T obj);

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枫以 2024-10-30 18:39:10

var objectMySettings = mySettings as object;
if (objectMySettings != null)
    saveSettings(ref objectMySettings);

var objectMySettings = mySettings as object;
if (objectMySettings != null)
    saveSettings(ref objectMySettings);

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倦话 2024-10-30 18:39:10

void saveSettings(ref object)

saveSettings 的定义格式错误。您需要在“ref object”后面添加一个标识符。但我会将“ref 对象”改为字典。

void saveSettings(ref object)

The definition of saveSettings is malformed. You need an identifier after "ref object". But I'd make the "ref object" a Dictionary instead.

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牵强ㄟ 2024-10-30 18:39:10

这样做：

 protected void Button1_Click(object sender, EventArgs e)
{
    Dictionary<string, string> mySettings = new Dictionary<string, string>();

    saveSettings(mySettings);
}

void saveSettings( Dictionary<string, string> Settings)
{
}

Do it this way:

 protected void Button1_Click(object sender, EventArgs e)
{
    Dictionary<string, string> mySettings = new Dictionary<string, string>();

    saveSettings(mySettings);
}

void saveSettings( Dictionary<string, string> Settings)
{
}

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花想c 2024-10-30 18:39:10

像这样的东西：

static void Main()
{

   Dictionary<string, string> mySettings = new Dictionary<string, string>();
   object o = mySettings;
   SaveSettings(ref o);
   // o now has an item.
}

static void SaveSettings(ref object o)
{
    var d = o as Dictionary<string, string>;
    d.Add("Some", "String");
}

编辑一些调试输出。
在此处输入图像描述

Something like this:

static void Main()
{

   Dictionary<string, string> mySettings = new Dictionary<string, string>();
   object o = mySettings;
   SaveSettings(ref o);
   // o now has an item.
}

static void SaveSettings(ref object o)
{
    var d = o as Dictionary<string, string>;
    d.Add("Some", "String");
}

EDIT Some debugging output.
enter image description here

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