[英]how to make a case insensitive dictionary for var input - C#
var fruitDictionary = new Dictionary<string, string>(StringComparer.InvariantCultureIgnoreCase) { { "Apple" , "Fruit" }, { "Orange", "Fruit" }, { "Spinach", "Greens" } };
TextRange textRange = new TextRange(richTextBox1.Document.ContentStart, richTextBox1.Document.ContentEnd);
string data = textRange.Text;
var output = new StringBuilder(data);
foreach (var kvp in fruitDictionary)
output.Replace(kvp.Key, kvp.Value);
var result = output.ToString();
richTextBox2.AppendText(result);
它可以正常工作,但是如果输入格式不正确,它将无法正常工作。 例如,在Apple上,输出为Fruit,但在Apple上,仍显示为apple
通过将字典的比较器设置为StringComparer.InvariantCultureIgnoreCase
,关键字查找将变为区域性var a = fruitDictionary["apple"];
区分大小写-例如, var a = fruitDictionary["apple"];
并且var b = fruitDictionary["ApPlE"]
将产生相同的结果。 就是说,您对与此无关的StringBuilder
实例执行替换操作。 StringBuilder.Replace
和String.Replace
都没有让您配置字符串比较选项的重载,因此您必须制作一个扩展方法。
public static string Replace(this string str, string oldValue, string newValue,
StringComparison comparison = StringComparison.Ordinal)
{
var index = str.IndexOf(oldValue, comparison);
while (index >= 0)
{
str = str.Remove(index, oldValue.Length);
str = str.Insert(index, newValue);
index = str.IndexOf(oldValue, comparison);
}
return str;
}
var fruitDictionary = new Dictionary<string, string>(StringComparer.InvariantCultureIgnoreCase) { { "Apple" , "Fruit" }, { "Orange", "Fruit" }, { "Spinach", "Greens" } };
TextRange textRange = new TextRange(richTextBox1.Document.ContentStart, richTextBox1.Document.ContentEnd);
string data = textRange.Text;
foreach (var kvp in fruitDictionary)
data = data.Replace(kvp.Key, kvp.Value, StringComparison.InvariantCultureIgnoreCase)
richTextBox2.AppendText(data);
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