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WPF】给下拉列表ComboBox绑定数据

 版权声明:本文为博主原创文章,未经博主允许不得转载。 https://blog.csdn.net/qq_18995513/article/details/54585895

思路:给ComboBox控件设置它的ItemSource绑定到ViewModel中的某个列表上,该列表是某个实体类的集合(如List< Person >),而ComboBox列表要显示的是该实体类的某一属性(如person.Name)。

大致步骤:

  • 联网获取到这组数据的Json,然后反序列化为对应的List< 实体类 >列表。
  • 由于只想要绑定这组实体类的Name属性,所以再准备一个List< string >集合,保存List< 实体类 >中的每一个对象的Name属性
  • 最后ComboBox的ItemSource绑定到这个List< string >集合即可。

前台绑定:

<ComboBox ItemsSource="{Binding CityName}"/>
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ViewModel:

private List<City> cityList;    // 当前省份下所有城市的信息
public List<City> CityList
{
    get { return cityList; }
    set { SetProperty(ref cityList, value); }
}

private List<string> cityName;  // 前台下拉列表绑定当前省份下所有城市名
public List<string> CityName
{
    get { return cityName; }
    set { SetProperty(ref cityName, value); }
}

// 记得在ViewModel的构造函数中初始化这两个List列表
// ... InitList()...

public class City
{
    public int cityId { get; set; }
    public string cityName { get; set; }
}
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Controller层:

// 联网获取城市/小区Json数据
private void GetCityAndCommunityJsonData()
{
    Dictionary<string, string> dic = new Dictionary<string, string>();
    dic.Add("provinceName", "广西壮族自治区"); // 暂时写死
    string request = GlobalVariable.GET_CITYS_BY_PROVINCE_TO_CLIENT;
    string json = NetworkUtils.Instance.HttpPostRequest(request, dic);
    System.Console.WriteLine("完成:获取城市/小区数据");

    Response<City> response = JsonConvert.DeserializeObject<Response<City>>(json);
    houseTypeViewModel.CityList.Clear();
    houseTypeViewModel.CityList = response.result;

    houseTypeViewModel.CityName.Clear();
    foreach (var item in houseTypeViewModel.CityList)
    {
        houseTypeViewModel.CityName.Add(item.cityName);
    }

}
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联网工具类:

public string HttpPostRequest(string url, IDictionary<string, string> parameters)
{
    HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(GlobalVariable.SERVER_ADDRESS_TEMP + url);
    httpWebRequest.Method = "POST";
    httpWebRequest.ContentType = "application/x-www-form-urlencoded;charset=utf8";
    httpWebRequest.Timeout = 20000;

    // 参数
    if (!(parameters == null || parameters.Count == 0))
    {
        StringBuilder buffer = new StringBuilder();
        int i = 0;
        foreach (string key in parameters.Keys)
        {
            if (i > 0)
            {
                buffer.AppendFormat("&{0}={1}", key, parameters[key]);
            }
            else
            {
                buffer.AppendFormat("{0}={1}", key, parameters[key]);
            }
            i++;
        }
        // 给文本数据编码
        byte[] data = Encoding.UTF8.GetBytes(buffer.ToString());

        // 往请求的流里写数据
        using (Stream stream = httpWebRequest.GetRequestStream())
        {
            stream.Write(data, 0, data.Length);
        }
    }

    // 从响应对象中获取数据
    HttpWebResponse httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();
    StreamReader streamReader = new StreamReader(httpWebResponse.GetResponseStream(), Encoding.GetEncoding("UTF-8"));
    string responseContent = streamReader.ReadToEnd();

    streamReader.Close();
    httpWebResponse.Close();
    httpWebRequest.Abort();

    return responseContent;
}
原文地址:https://www.cnblogs.com/LiZhongZhongY/p/11066891.html