111 lines
3.3 KiB
C#
111 lines
3.3 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Text;
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using System.Text.RegularExpressions;
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namespace Infrastructure.Extensions
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{
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public static class StringExtension
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{
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/// <summary>
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/// SQL条件拼接
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/// </summary>
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/// <param name="str"></param>
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/// <param name="condition"></param>
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/// <returns></returns>
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public static string If(this string str, bool condition)
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{
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return condition ? str : string.Empty;
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}
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/// <summary>
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/// 判断是否为空
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/// </summary>
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/// <param name="str"></param>
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/// <returns></returns>
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public static bool IfNotEmpty(this string str)
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{
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return !string.IsNullOrEmpty(str);
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}
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/// <summary>
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/// 注意：如果替换的旧值中有特殊符号，替换将会失败，解决办法 例如特殊符号是“(”： 要在调用本方法前加oldValue=oldValue.Replace("(","//(");
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/// </summary>
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/// <param name="input"></param>
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/// <param name="oldValue"></param>
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/// <param name="newValue"></param>
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/// <returns></returns>
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public static string ReplaceFirst(this string input, string oldValue, string newValue)
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{
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Regex regEx = new Regex(oldValue, RegexOptions.Multiline);
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return regEx.Replace(input, newValue == null ? "" : newValue, 1);
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}
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/// <summary>
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/// 骆驼峰转下划线
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/// </summary>
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/// <param name="name"></param>
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/// <returns></returns>
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public static string ToSmallCamelCase(string name)
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{
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var stringBuilder = new StringBuilder();
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stringBuilder.Append(name.Substring(0, 1).ToLower());
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for (var i = 0; i < name.Length; i++)
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{
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if (i == 0)
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{
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stringBuilder.Append(name.Substring(0, 1).ToLower());
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}
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else
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{
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if (name[i] >= 'A' && name[i] <= 'Z')
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{
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stringBuilder.Append($"_{name.Substring(i, 1).ToLower()}");
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}
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else
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{
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stringBuilder.Append(name[i]);
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}
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}
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}
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return stringBuilder.ToString();
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}
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/// <summary>
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/// 下划线命名转驼峰命名
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/// </summary>
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/// <param name="underscore"></param>
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/// <returns></returns>
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public static string UnderScoreToCamelCase(this string underscore)
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{
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string[] ss = underscore.Split("_");
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if (ss.Length == 1)
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{
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return underscore;
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}
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StringBuilder sb = new StringBuilder();
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sb.Append(ss[0]);
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for (int i = 1; i < ss.Length; i++)
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{
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sb.Append(ss[i].FirstUpperCase());
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}
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return sb.ToString();
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}
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/// <summary>
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/// 首字母转大写
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/// </summary>
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/// <param name="str"></param>
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/// <returns></returns>
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public static string FirstUpperCase(this string str)
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{
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return string.IsNullOrEmpty(str) ? str : str.Substring(0, 1).ToUpper() + str[1..];
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}
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}
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}
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