检查一个字符串是否包含所有其他字符串 [英] Check if a string contains all other strings

问题描述

我正在尝试编写软件的一部分，以尝试显示与搜索条件匹配的结果。

I am trying to code a part of a software where I try to show the results that match search criteria.

我有一个文本框，可以在其中键入一个或我想搜索更多的单词，并包含4个不同的列和12行的listview。这个想法是每个listview行包含很多单词，我只想查看包含我在文本框中键入的所有单词的行。我已经完成了仅搜索一个术语的代码。我遇到的问题是我不完全了解该怎么做，而是使用多个术语而不是仅一个术语。

I have a textbox where I can type one or more words I want to search and a listview that contains 4 different columns and a dozen rows. The idea is that each listview row contains lots of words and I want to see only the rows that contain all the words I have typed in the textbox. I have finished the code that searches for one term only. The problem I am having is that I don't fully understand how to do the same, but using multiple terms instead of one term only.

在文本框中，我写了我要搜索的单词用空格隔开。我有一个变量，其中列表视图行的整个内容由：分隔（示例=> col1row1content：col1row2content：col1row3content等）。总结一下，我想检查一个字符串（一行的全部内容）是否包含所有其他字符串（我在文本框中键入的每个单词）。

In the textbox, I write the words I want to search separated by a space. I have a variable where I keep the whole content of the listview row separated by : (example => col1row1content:col1row2content:col1row3content,etc). Summarizing, I want to check if a string (the full content of a row) contains all other strings (each word I have typped in the textbox).

这是我已实现的代码：

Dim textboxFullContentArray As String() = textboxSearch.Split(New Char() {" "c})
Dim Content As String
Dim containsAll As Boolean = False
Dim wholeRowContent(listviewMain.Items.Count - 1) As String ' each index of the array keeps the entire row content (one array contains all 4 cells of the row)



' wholeRowContent contains in one index the entire content of a row. That means, 
' the index contains the 4 cells that represent an entire row. 
' The format is like "rowData1:rowData2:rowData3:rowData4" (omitted for simplicity)
    For Q As Integer = 0 To listviewMain.Items.Count - 1
        For Each Content In textboxFullContentArray
            If wholeRowContent(Q).ToLower.Contains(Content) Then
                containsAll = True
                ' rest of the code...
            ElseIf Not wholeRowContent(Q).ToLower.Contains(Content) Then
                containsAll = False
                Exit For
            End If
        Next
    Next

但是，当然，此代码显示了误报，我认为这不是一个好的解决方案。我认为它一定要容易得多，并且使这个概念过于复杂。

But of course, this code is showing false positives and I think it's not a good solution. I think it must be much easier and I am overcomplicating the concept.

我正在使用VB.Net 2013

I am using VB.Net 2013

推荐答案

您可以确定 String 是否包含用单行代码包含的所有子字符串列表：

You can determine whether a String contains all of a list of substrings with a single line of code:

If substrings.All(Function(s) str.IndexOf(s, StringComparison.OrdinalIgnoreCase) >= 0) Then

请注意，我实际上已经实现了不区分大小写的比较，而不是使用 ToLower 或 ToUpper 。

Notice that I have actually implemented a case-insensitive comparison, rather than using ToLower or ToUpper.

调用 IndexOf 而不是包含，但是您猜怎么着：包含实际上是调用 IndexOf 内部还是这样：

It may not seem as neat to call IndexOf rather than Contains but guess what: Contains actually calls IndexOf internally anyway:

public bool Contains(string value)
{
    return this.IndexOf(value, StringComparison.Ordinal) >= 0;
}

如果需要不区分大小写的<$，则可以编写自己的扩展方法c $ c>包含方法：

You can write your own extension methods if you want a case-insensitive Contains method:

<Extension>
Public Function Contains(source As String,
                         value As String,
                         comparisonType As StringComparison) As Boolean
    Return source.IndexOf(value, comparisonType) >= 0
End Function

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