WPF入门到精通:4.页面增删改查及调用接口（待完善）

在WPF中，页面的增删改查可以通过使用DataGrid等控件来实现。接口的调用可以使用HttpClient或RestSharp等网络库来完成。

1.页面增删改查

使用DataGrid控件来展示数据，并通过绑定数据源来实现数据的增删改查操作。示例代码如下：

XAML代码：

学生View

<DataGrid ItemsSource="{Binding Students}"          SelectedItem="{Binding SelectedItem}"><DataGrid.Columns><DataGridTextColumn Header="学号" Binding="{Binding ID}" /><DataGridTextColumn Header="姓名" Binding="{Binding Name}" /><DataGridTextColumn Header="年龄" Binding="{Binding Age}" /></DataGrid.Columns>
</DataGrid>

C#代码：

学生实体Model

public class Student
{public string ID { get; set; }public string Name { get; set; }public int Age { get; set; }
}

ViewModel

public class MainViewModel : ViewModelBase
{private ObservableCollection<Student> students;public ObservableCollection<Student> Students{get { return students; }set{students = value;PCEH();}}private Student studentModel;public Student StudentModel{get { return studentModel; }set{studentModel= value;PCEH();}}public MainViewModel(){Students = new ObservableCollection<Student>(){new Student() { ID = "001", Name = "张三", Age = 18 },new Student() { ID = "002", Name = "李四", Age = 19 },new Student() { ID = "003", Name = "王五", Age = 20 }};}public void AddStudent(Student student){Students.Add(student);}public void RemoveStudent(Student student){Students.Remove(student);}public void UpdateStudent(Student student){var oldStudent = Students.FirstOrDefault(s => s.ID == student.ID);if (oldStudent != null){oldStudent.Name = student.Name;oldStudent.Age = student.Age;}}
}

2.调用接口

使用HttpClient库发送HTTP请求，并通过反序列化方式来解析服务器返回的数据。示例代码如下：

var client = new HttpClient();
var response = await client.GetAsync("http://api.example.com/users");
if (response.IsSuccessStatusCode)
{var content = await response.Content.ReadAsStringAsync();var users = JsonConvert.DeserializeObject<List<User>>(content);
}

其中，User为服务器返回数据所对应的实体类。反序列化过程中需要使用Newtonsoft.Json库，可通过NuGet进行安装。

另外，如果接口需要进行授权认证，可通过HttpClient的Header属性来添加认证信息：

client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);