字符串,对象>如何解释<转换;到字典<字符串,字符串>在c# [英] How to convert Dictionary<string, object> to Dictionary<string, string> in c#
问题描述
我有下面的代码在C#
Dictionary<string, object> dObject = new Dictionary<string, object>();
我想 dObject
转换为字典<字符串,字符串>
。我怎样才能做到这一点。
I want to convert dObject
to Dictionary<string, string>
. How can I do this?
推荐答案
使用的ToDictionary方法:
Use the ToDictionary method:
Dictionary<string, string> dString = dObject.ToDictionary(k => k.Key, k => k.Value.ToString());
在这里,您重用原来的字典中的键,就可以值转换为使用ToString方法字符串。
Here you reuse the key from the original dictionary and you convert the values to strings using the ToString method.
如果你的字典可以包含空值,你应该执行的ToString前添加一个空检查:
If your dictionary can contain null values you should add a null check before performing the ToString:
Dictionary<string, string> dString = dObject.ToDictionary(k => k.Key, k => k.Value == null ? "" : k.Value.ToString());
这部作品的原因是,词典<字符串对象> code>实际上是一个
的IEnumerable<是。通过枚举上面的代码示例循环并建立使用ToDictionary方法一个新的字典。
The reason this works is that the Dictionary<string, object>
is actually an IEnumerable<KeyValuePair<string,object>>
. The above code example iterates through the enumerable and builds a new dictionary using the ToDictionary method.
编辑:
在NET 2.0,你不能使用ToDictionary方法,但你可以使用老式的foreach达到相同的:
In .Net 2.0 you cannot use the ToDictionary method, but you can achieve the same using a good old-fashioned foreach:
Dictionary<string, string> sd = new Dictionary<string, string>();
foreach (KeyValuePair<string, object> keyValuePair in dict)
{
sd.Add(keyValuePair.Key, keyValuePair.Value.ToString());
}
EDIT2:
如果您是在NET 2.0,您可以在字典中的以下应该是安全有NULL值:
If you are on .Net 2.0 and you can have null values in the dictionary the following should be safe:
Dictionary<string, string> sd = new Dictionary<string, string>();
foreach (KeyValuePair<string, object> keyValuePair in dict)
{
sd.Add(keyValuePair.Key, keyValuePair.Value == null ? "" : keyValuePair.Value.ToString());
}
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