csharp-sdk-upm/RTM/Source/Internal/DataEngine/Controller/StringEngine.cs

37 lines
1.2 KiB
C#
Raw Normal View History

2019-07-19 15:01:34 +08:00
using System;
using System.Linq;
using System.Collections.Generic;
using System.Linq.Expressions;
using System.Text;
namespace LeanCloud.Realtime.Internal
{
internal static class StringEngine
{
internal static string Random(this string str, int length)
{
const string chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz";
var random = new Random();
return new string(Enumerable.Repeat(chars, length)
.Select(s => s[random.Next(s.Length)]).ToArray());
}
internal static string TempConvId<T>(this IEnumerable<T> objs)
{
var orderedBase64Strs = objs.Select(obj => Encoding.UTF8.ToBase64(obj.ToString())).OrderBy(a => a, StringComparer.Ordinal).ToArray();
return "_tmp:" + string.Join("$", orderedBase64Strs);
}
internal static string ToBase64(this System.Text.Encoding encoding, string text)
{
if (text == null)
{
return null;
}
byte[] textAsBytes = encoding.GetBytes(text);
return Convert.ToBase64String(textAsBytes);
}
}
}