Preface
Validating data is a common task that occurs throughout all application layers, from the presentation to the persistence layer. Often the same validation logic is implemented in each layer ...
看Interpolated Strings之前,让我们先看EF Core 2.0 的一个新的特性:String interpolation in FromSql and
ExecuteSqlCommand。
var city = "London";
using (var context = CreateContext())
{
context.Cu...
今天在Fragment申请权限时代码如下:
public void getContacts(){
int flag = ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.READ_CONTACTS);
if (flag!= PackageMana...