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Update README.md

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懒得勤快
2020-09-03 16:54:30 +08:00
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@@ -973,6 +973,7 @@ var table=list.ToDataTable(); // 转换成DataTable类型
table.AddIdentityColumn(); //给DataTable增加一个自增列
table.HasRows(); // 检查DataTable 是否有数据行
table.ToList<T>(); // datatable转List
var set = list.ToHashSet(s=>s.Name);// 转HashSet
```
### 40.Mime类型
```csharp
@@ -986,6 +987,14 @@ DateTime.Now.GetTotalSeconds(); // 获取该时间相对于1970-01-01 00:00:00
DateTime.Now.GetTotalMilliseconds(); // 获取该时间相对于1970-01-01 00:00:00的毫秒数
DateTime.Now.GetTotalMicroseconds(); // 获取该时间相对于1970-01-01 00:00:00的微秒数
DateTime.Now.GetTotalNanoseconds(); // 获取该时间相对于1970-01-01 00:00:00的纳秒数
var indate=DateTime.Parse("2020-8-3").In(DateTime.Parse("2020-8-2"),DateTime.Parse("2020-8-4"));//true
//时间段计算工具
var range = new DateTimeRange(DateTime.Parse("2020-8-3"), DateTime.Parse("2020-8-5"));
range.Union(DateTime.Parse("2020-8-4"), DateTime.Parse("2020-8-6")); //连接两个时间段，结果：2020-8-3~2020-8-6
range.In(DateTime.Parse("2020-8-3"), DateTime.Parse("2020-8-6"));//判断是否在某个时间段内，true
var (intersected,range2) = range.Intersect(DateTime.Parse("2020-8-4"), DateTime.Parse("2020-8-6"));//两个时间段是否相交，(true,2020-8-3~2020-8-4)
range.Contains(DateTime.Parse("2020-8-3"), DateTime.Parse("2020-8-4"));//判断是否包含某个时间段，true
...
```
### 42.流转换