[c#] 拆分CamelCase



Answers

我用了:

    public static string SplitCamelCase(string input)
    {
        return System.Text.RegularExpressions.Regex.Replace(input, "([A-Z])", " $1", System.Text.RegularExpressions.RegexOptions.Compiled).Trim();
    }

摘自http://weblogs.asp.net/jgalloway/archive/2005/09/27/426087.aspx

Question

這都是asp.net c#。

我有一個枚舉

public enum ControlSelectionType 
{
    NotApplicable = 1,
    SingleSelectRadioButtons = 2,
    SingleSelectDropDownList = 3,
    MultiSelectCheckBox = 4,
    MultiSelectListBox = 5
}

它的數值存儲在我的數據庫中。 我在數據網格中顯示此值。

<asp:boundcolumn datafield="ControlSelectionTypeId" headertext="Control Type"></asp:boundcolumn>

ID對用戶沒有任何意義,因此我已使用以下內容將boundcolumn更改為模板列。

<asp:TemplateColumn>
    <ItemTemplate>
        <%# Enum.Parse(typeof(ControlSelectionType), DataBinder.Eval(Container.DataItem, "ControlSelectionTypeId").ToString()).ToString()%>
    </ItemTemplate>
</asp:TemplateColumn>

這樣做要好得多......但是,如果有一個簡單的函數我可以放在Enum周圍將它拆分為Camel case,以便在數據網格中很好地包裝它。

注意:我完全清楚有更好的方法可以做到這一切。 這個屏幕純粹是在內部使用的,我只想快速入門以便更好地顯示它。




除非您擁有Web服務,否則Eoin Campbell的解決方案效果很好。

您需要執行以下操作,因為描述屬性不可序列化。

[DataContract]
public enum ControlSelectionType
{
    [EnumMember(Value = "Not Applicable")]
    NotApplicable = 1,
    [EnumMember(Value = "Single Select Radio Buttons")]
    SingleSelectRadioButtons = 2,
    [EnumMember(Value = "Completely Different Display Text")]
    SingleSelectDropDownList = 3,
}


public static string GetDescriptionFromEnumValue(Enum value)
{
    EnumMemberAttribute attribute = value.GetType()
        .GetField(value.ToString())
        .GetCustomAttributes(typeof(EnumMemberAttribute), false)
        .SingleOrDefault() as EnumMemberAttribute;
    return attribute == null ? value.ToString() : attribute.Value;
}



這是一個可以靈活處理數字和多個大寫字符的擴展方法,並且還允許在最終字符串中使用上層特定的首字母縮略詞:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Globalization;
using System.Text.RegularExpressions;
using System.Web.Configuration;

namespace System
{
    /// <summary>
    /// Extension methods for the string data type
    /// </summary>
    public static class ConventionBasedFormattingExtensions
    {
        /// <summary>
        /// Turn CamelCaseText into Camel Case Text.
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        /// <remarks>Use AppSettings["SplitCamelCase_AllCapsWords"] to specify a comma-delimited list of words that should be ALL CAPS after split</remarks>
        /// <example>
        /// wordWordIDWord1WordWORDWord32Word2
        /// Word Word ID Word 1 Word WORD Word 32 Word 2
        /// 
        /// wordWordIDWord1WordWORDWord32WordID2ID
        /// Word Word ID Word 1 Word WORD Word 32 Word ID 2 ID
        /// 
        /// WordWordIDWord1WordWORDWord32Word2Aa
        /// Word Word ID Word 1 Word WORD Word 32 Word 2 Aa
        /// 
        /// wordWordIDWord1WordWORDWord32Word2A
        /// Word Word ID Word 1 Word WORD Word 32 Word 2 A
        /// </example>
        public static string SplitCamelCase(this string input)
        {
            if (input == null) return null;
            if (string.IsNullOrWhiteSpace(input)) return "";

            var separated = input;

            separated = SplitCamelCaseRegex.Replace(separated, @" $1").Trim();

            //Set ALL CAPS words
            if (_SplitCamelCase_AllCapsWords.Any())
                foreach (var word in _SplitCamelCase_AllCapsWords)
                    separated = SplitCamelCase_AllCapsWords_Regexes[word].Replace(separated, word.ToUpper());

            //Capitalize first letter
            var firstChar = separated.First(); //NullOrWhiteSpace handled earlier
            if (char.IsLower(firstChar))
                separated = char.ToUpper(firstChar) + separated.Substring(1);

            return separated;
        }

        private static readonly Regex SplitCamelCaseRegex = new Regex(@"
            (
                (?<=[a-z])[A-Z0-9] (?# lower-to-other boundaries )
                |
                (?<=[0-9])[a-zA-Z] (?# number-to-other boundaries )
                |
                (?<=[A-Z])[0-9] (?# cap-to-number boundaries; handles a specific issue with the next condition )
                |
                (?<=[A-Z])[A-Z](?=[a-z]) (?# handles longer strings of caps like ID or CMS by splitting off the last capital )
            )"
            , RegexOptions.Compiled | RegexOptions.IgnorePatternWhitespace
        );

        private static readonly string[] _SplitCamelCase_AllCapsWords =
            (WebConfigurationManager.AppSettings["SplitCamelCase_AllCapsWords"] ?? "")
                .Split(new[] { ',' }, StringSplitOptions.RemoveEmptyEntries)
                .Select(a => a.ToLowerInvariant().Trim())
                .ToArray()
                ;

        private static Dictionary<string, Regex> _SplitCamelCase_AllCapsWords_Regexes;
        private static Dictionary<string, Regex> SplitCamelCase_AllCapsWords_Regexes
        {
            get
            {
                if (_SplitCamelCase_AllCapsWords_Regexes == null)
                {
                    _SplitCamelCase_AllCapsWords_Regexes = new Dictionary<string,Regex>();
                    foreach(var word in _SplitCamelCase_AllCapsWords)
                        _SplitCamelCase_AllCapsWords_Regexes.Add(word, new Regex(@"\b" + word + @"\b", RegexOptions.Compiled | RegexOptions.IgnoreCase));
                }

                return _SplitCamelCase_AllCapsWords_Regexes;
            }
        }
    }
}



如果C#3.0是一個選項,您可以使用以下單行來完成工作:


Regex.Matches(YOUR_ENUM_VALUE_NAME, "[A-Z][a-z]+").OfType<Match>().Select(match => match.Value).Aggregate((acc, b) => acc + " " + b).TrimStart(' ');



我也有一個我不得不分開的enum 。 在我的情況下,這種方法解決了問題 -

string SeparateCamelCase(string str)
{
    for (int i = 1; i < str.Length; i++)
    {
        if (char.IsUpper(str[i]))
        {
            str = str.Insert(i, " ");
            i++;
        }
    }
    return str;
}



使用LINQ:

var chars = ControlSelectionType.NotApplicable.ToString().SelectMany((x, i) => i > 0 && char.IsUpper(x) ? new char[] { ' ', x } : new char[] { x });

Console.WriteLine(new string(chars.ToArray()));



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