WebMay 23, 2024 · Check if element at position [x] exists in the list. List list = new list (); list.add ("str1"); list.add ("str2"); list.add ("str3"); and I want to know if for … WebJul 23, 2012 · You can't change how C# works. If you call split, then you will get an array, and the number of elements you get, depends on how often your delimiter is in the string. So, as soon as you use an index other than 0, you need to first check if it exists.

c# - 是否可以取消刪除Lucene.net索引中的文檔？ - 堆棧內存溢出

WebJan 24, 2024 · About this method Check if an index exists or not. You can initialize an index with any name. The index is created on Algolia’s servers when you add objects or set settings. To prevent accidentally creating new indices, or changing existing indices, you can use the exists method. The exists method returns a boolean that indicates whether an … imv scotland

List .IndexOf Method (System.Collections.Generic)

WebMar 10, 2024 · The Array.Exists () function returns a boolean value that is true if the element exists in the array and false if it does not exist in the array. The following code example shows us how we can check for an element in an array with the Array.Exists () function in C#. using System; namespace check_element_in_array { class Program { … Web我需要從我的Lucene索引中刪除文檔，然后以后可以重新添加它們。 看來，如果我將文檔標記為已刪除，然后再次嘗試添加它，則該文檔將保持刪除狀態。 如何 刪除 文檔 這就是我將文檔標記為 已刪除 的方式： 因此，如果我想再次 激活 此文檔，該怎么辦 adsbygoogle window.adsbygo WebTo check if a key exists in a C# dictionary and pass on its value, you can use the TryGetValue method of the dictionary. This method takes the key to look up and an output parameter that will receive the value if the key exists in the dictionary. Here's an example of how you can check if a key exists in a dictionary and pass on its value: imv short interest