Question

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);

它正常工作，但是如果输入格式不正确，它将无法工作。例如，在Apple上，输出为Fruit，但在Apple上，仍然显示apple

Answer 1

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且不区分大小写-即var a = fruitDictionary["apple"];和var b = fruitDictionary["ApPlE"]将产生相同的结果。也就是说，您在与此无关的StringBuilder实例上执行替换操作。 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);

如何使var输入不区分大小写的字典-C＃

1 个答案: