46 lines
1.4 KiB
C#
46 lines
1.4 KiB
C#
using System;
|
|
using System.Collections.Generic;
|
|
using System.Text;
|
|
using System.Text.RegularExpressions;
|
|
|
|
namespace Infrastructure.Extensions
|
|
{
|
|
public static class StringExtension
|
|
{
|
|
|
|
/// <summary>
|
|
/// SQL条件拼接
|
|
/// </summary>
|
|
/// <param name="str"></param>
|
|
/// <param name="condition"></param>
|
|
/// <returns></returns>
|
|
public static string If(this string str, bool condition)
|
|
{
|
|
return condition ? str : string.Empty;
|
|
}
|
|
/// <summary>
|
|
/// 判断是否为空
|
|
/// </summary>
|
|
/// <param name="str"></param>
|
|
/// <returns></returns>
|
|
public static bool IfNotEmpty(this string str)
|
|
{
|
|
return !string.IsNullOrEmpty(str);
|
|
}
|
|
|
|
/// <summary>
|
|
/// 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("(","//(");
|
|
/// </summary>
|
|
/// <param name="input"></param>
|
|
/// <param name="oldValue"></param>
|
|
/// <param name="newValue"></param>
|
|
/// <returns></returns>
|
|
public static string ReplaceFirst(this string input, string oldValue, string newValue)
|
|
{
|
|
Regex regEx = new Regex(oldValue, RegexOptions.Multiline);
|
|
return regEx.Replace(input, newValue == null ? "" : newValue, 1);
|
|
|
|
}
|
|
}
|
|
}
|