用c#中字典中的值替换字符串中的单词 [英] Replacing words in a string with values from Dictionary in c#

问题描述

我有一个简单的 dictionary 像这样:

varfruitDictionary = new Dictionary{Apple,Fruit}, {Orange, Fruit}, {Spinach, Greens}

我有一个像

这样的字符串

varfruitString = Apple Orange Spinach Orange Apple Spinach

如何用字典中的匹配词替换该句子中所有出现的特定词?

(即)上面的句子应该是Fruit Fruit Greens Fruit Fruit Fruit ?

非常感谢任何想法.

我尝试过这样的事情:

var outputString = string.Empty;FruitString.ToArray().ToList().Foreach(item =>{if (fruitDictionary.ContainsKey(item)){outputString = outputString + FruitDictionary[item];}

对此有什么最佳解决方案吗?上面的代码不是最优的，因为它遍历给定数组的整个长度！

解决方案

简单:

var output = new StringBuilder(fruitString);foreach(fruitDictionary 中的 var kvp)output.Replace(kvp.Key, kvp.Value);var 结果 = output.ToString();

这只是用你的 fruitString 初始化一个 StringBuilder，并遍历 Dictionary，用值替换它找到的每个键.>

I have a simple dictionary like this:

var fruitDictionary = new Dictionary<string, string> {Apple,Fruit}, {Orange, Fruit}, {Spinach, Greens}

and I have a string like

var fruitString = Apple Orange Spinach Orange Apple Spinach

How to replace all occurrences of the particular word in that sentence with the matching-word from the dictionary?

(i.e.) The above sentence should read Fruit Fruit Greens Fruit Fruit Fruit ?

Any ideas is much appreciated.

EDIT:

I tried something like this:

var outputString = string.Empty;
fruitString.ToArray().ToList().Foreach(item =>
{
if (fruitDictionary.ContainsKey(item))
{
 outputString = outputString + fruitDictionary[item];

} 

Any optimal solution for this? The above code is not optimal because, it does traversing the entire-length of given array!

解决方案

Simply:

var output = new StringBuilder(fruitString);

foreach (var kvp in fruitDictionary)
    output.Replace(kvp.Key, kvp.Value);

var result = output.ToString();

This simply initializes a StringBuilder with your fruitString, and iterates over the Dictionary, replacing each key it finds with the value.

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