C# 对象列表到字符串列表
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C# Object List to String List
提问by Melih Mucuk
I have List<object>that seems above, I want to convert it to List<string>.
我有List<object>上面的内容，我想将其转换为List<string>.
How can I convert it ?
我怎样才能转换它？
I need List<string>that has 6 items (11:00,13:45,.... etc)
我需要List<string>有 6 个项目（11:00,13:45，.... 等）
采纳答案by Alyafey
var mylist = myObjectList.ConvertAll(x => x.ToString());
Edit
编辑
var mylist = myObjectList.ConvertAll(x => Convert.ToString(x));
thanks Scott Chamberlain
感谢斯科特张伯伦
To get first array of objects
获取第一个对象数组
var mylist = (myObjectList.First() as object[]).ToList()
.ConvertAll(x=>Convert.ToString(x));
To add rest to the list.
将休息添加到列表中。
mylist.AddRange(mylist.GetRange(1,myObjectList.Count-2).ConvertAll(x=>Convert.ToString(x)));
回答by Alexandre Rondeau
You can simply cast it using LinQ.
您可以使用 LinQ 简单地投射它。
myObjectList.Cast<string>();
Or filter all non-string
或过滤所有非字符串
myObjectList.OfType<string>();
回答by TGH
var stringList = yourObjectList.OfType<string>().ToList();
Remember to add the namespace System.Linq;
记得添加命名空间 System.Linq;
The OfType is needed to convert the array to an array<T>which is necessary in order to use it with LINQ
需要 OfType 将数组转换为一个array<T>，以便在 LINQ 中使用它是必需的
回答by Santin
Casting like :
铸造如：
var list = (List<String>) listObjects.
回答by Sriram Sakthivel
Try this
尝试这个
List<string> stringlist = objectList.Cast<string>()
.ToList();
If you're not certain about those elements are strings you can use Select
如果您不确定这些元素是字符串，您可以使用 Select
List<string> stringlist = objectList.Select(x=> x.ToString())
.ToList();
To avoid NullReferenceExceptionin case of null values try the following
为避免NullReferenceException出现空值，请尝试以下操作
List<string> stringlist = objectList.Where(x=> x != null)
.Select(x=> x.ToString())
.ToList();
回答by Scott Chamberlain
Using LINQ this is fairly easy. If you are sure they are all strings you can simply do
使用 LINQ 这相当容易。如果你确定它们都是字符串，你可以简单地做
int i = //Some code that sets i, like a for loop
var oldList = seanceInfo.theatre[i].seances;
List<string> newList = oldList.Cast<string>().ToList();
If you are not sure all of the objects are strings you need to perform some kind of conversion, however that is just as easy
如果您不确定所有对象都是字符串，则需要执行某种转换，但这同样简单
List<string> newList = oldList.Select(o => Convert.ToString(o)).ToList();
From your comment: "seances is List<object>, and first index of seances is object[]. I need these items.", I think what you reallywant may be a SelectMany
从您的评论：“降神会是List<object>，降神会的第一个索引是object[]。我需要这些项目。”，我认为您真正想要的可能是SelectMany
List<string> info = seanceInfo.theatre.SelectMany(x => x.seances).Select(x => Convert.ToString(x)).ToList();
This will take each seance in each theater and combine it in to one master list.
这将需要每个剧院的每次降神会并将其合并到一个主列表中。
