在 C# 中将 Object[] 数组转换为 string[] 数组？
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Converting a Object[] array to an string[] array in c#?
提问by JerryCai
I have many ways to do it but still want to know is there any offical API to convert object[] to string[] With null checked? Thanks
我有很多方法可以做到这一点，但仍然想知道是否有任何官方 API 可以将 object[] 转换为 string[] 并检查空值？谢谢
采纳答案by dtb
If you have a method to convert an objectto a string(or int) with null check, then you can use the Array.ConvertAll<TInput, TOutput> Methodto convert an object[]to a string[](or int[]):
如果您有将 an 转换object为 a string（或int）并带有空检查的方法，那么您可以使用Array.ConvertAll<TInput, TOutput> 方法将 an 转换object[]为 a string[]（或int[]）：
object[] input = ...;
string[] result = Array.ConvertAll<object, string>(input, ConvertObjectToString);
string ConvertObjectToString(object obj)
{
return obj?.ToString() ?? string.Empty;
}
If you want to skip items in the object[]array when converting to a string[], a more convenient approach might be using the extension methods of the Enumerable Class:
如果您想object[]在转换为 a 时跳过数组中的项目string[]，更方便的方法可能是使用Enumerable Class的扩展方法：
object[] input = ...;
string[] result = input.Where(x => x != null)
.Select(x => x.ToString())
.ToArray();
回答by Kaiser12
You could just run a simple conversion on it using the ConvertAll method in the Array class and a lambda on the object itself.
您可以使用 Array 类中的 ConvertAll 方法和对象本身的 lambda 对其运行简单的转换。
object[] inputArray = new object[10];
string[] resultArray = Array.ConvertAll(inputArray, x => x.ToString());
回答by Daniel Imms
Here is an extension method that allows the choice of including/excluding nulls, and what value to use to replace null if included.
这是一个扩展方法，允许选择包含/排除空值，以及使用什么值替换空值（如果包含）。
public static class ObjectArrayExtensions
{
public static string[] ToStringArray(this object[] array, bool includeNulls = false, string nullValue = "")
{
IEnumerable<object> enumerable = array;
if (!includeNulls)
enumerable = enumerable.Where(e => e != null);
return enumerable.Select(e => (e ?? nullValue).ToString()).ToArray();
}
}
Usage:
用法：
object[] array = new object[] { 10, "hello", 5, "world", null };
var stringArray = array.ToStringArray();
// stringArray = { "10", "hello", "5", "world" }
stringArray = array.ToStringArray(true);
// stringArray = { "10", "hello", "5", "world", "" }
stringArray = array.ToStringArray(true, "empty");
// stringArray = { "10", "hello", "5", "world", "empty" }
Thanks to 280Z28 for improving the answer.
感谢 280Z28 改进答案。
回答by ja72
Try this:
尝试这个：
object[] input = {1, 2, null, 4, 5, 0.438, 7};
int[] result = input.OfType<int>().Select((o) => (int)o).ToArray();
// {1, 2, 4, 5, 7}
Or alternative going through stringfirst:
或者string首先通过的替代方法：
object[] input = {1, 2, null, 4, 5, 6.438, 7};
int[] result = input.Where((o) => o != null)
.Select((o) =>
{
string s = o.ToString();
int x = 0;
int.TryParse(s, out x);
return x;
}).ToArray();
// { 1, 2, 4, 5, 0, 7}
