Web16 mei 2024 · If you only plan to iterate the result collection, you should use ToArray (). Indeed, foreach will be faster on an array than on a List. C# foreach(var item in enumerable.ToArray ()) { // ... } // Iterate a List could be a few times slower than T [] foreach(var item in enumerable.ToList ()) { // ... } # Conclusion Web@Hannesh, my guess, because I haven't investigated, is that the backing array of the list will have many empty slots that will be filled during subsequent Add operations. This is to …
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WebЯ хочу записать несколько данных xml-файла в один csv-файл. Впервые записать данные из первого xml-файла в csv-файл. Создано 8 столбцов, а для записи данных второго xml-файла в 9-й столбец того же csv-файла. Web1 mei 2015 · A List contains an array internally to hold all the elements. The array grows if the capacity is no longer sufficient for the list. Any time that happens, the list will copy all … the pinch of nom cookbook
How do I convert an Array to a List in C#? - Stack Overflow
Web在一个真正的 IEnumerable 上,它不能被强制转换为其他任何东西,你通过使用 yield return 迭代器方法来强制执行, ToArray 正在调用 ToList , 不是因为 ToList 更快,但更灵活,它准备处理未知的数据计数。 我们必须避免枚举枚举两次,如果使用 Count () 会发生什么? 扩展名,例如。 ToArray () 会更快 - 如果您事先知道元素的数量。 如果源是 ICollection ,就 … WebAs ed replied in the comment you can use the TextFieldParser class by passing the string in the constructor. Another way would be to use regular expressions to solve it. Web2、使用LINQ的Where和ToArray方法 另一种使用LINQ的方法是使用Where方法来过滤出不包含要删除元素的序列,然后使用ToArray方法将序列转换回数组。 这种方法的优点是它更简洁,但在处理大型数据集时可能会比第一个方法慢。 sideboard table three side shelves