C# WPF多页面间的数据共享(经典)

Posted 2023-01-09 dotNET跨平台

概述

    实现页面间的数据共享有很多方法，比如：①事件的发布订阅 ②委托

③ioc容器④静态类等，这节主要通过静态的集合实现数据的添加和获取。

实现效果如下：数据在登录页面写入字典，然后在conductor页面获取

代码解析

   -. 数据写入：

public void SetData()
        
            DataShareBase.SetData<string>(CommonConstant.OfficialAccount, "dotnet讲堂");
            var loginViewModel = new LoginViewModel();
            loginViewModel.UserInformation = new UserInformation()
            
                UserName = "zls365",
                Password = "abc123"
            ;
            DataShareBase.SetData<LoginViewModel>(CommonConstant.LoginViewModelKey, loginViewModel);
        

-. 数据获取：

public void GetData()
        
            string dynamicValue = DataShareBase.GetData<string>(CommonConstant.OfficialAccount);
            DXMessageBox.Show(dynamicValue, CommonConstant.OfficialAccount, MessageBoxButton.OK, MessageBoxImage.Information);


            LoginViewModel dynamicObject = DataShareBase.GetData<LoginViewModel>(CommonConstant.LoginViewModelKey);
            StringBuilder stringBuild = new StringBuilder();
            stringBuild.AppendLine(dynamicObject.UserInformation.UserName);
            stringBuild.AppendLine(dynamicObject.UserInformation.Password);


            DXMessageBox.Show(stringBuild.ToString(), CommonConstant.LoginViewModelKey, MessageBoxButton.OK, MessageBoxImage.Information);
        

写入的方法封装在类DataShareBase

using System;
using System.Collections.Concurrent;


namespace Caliburn.Micro.Hello.Helper

    public class DataShareBase
    
        private static readonly Common.Logging.ILog logger = Common.Logging.LogManager.GetLogger<DataShareBase>();
        /// <summary>
        /// Dynamic Data
        /// </summary>
        public static ConcurrentDictionary<string, object> DynamicData  get; set;  = new ConcurrentDictionary<string, object>();


        public static void SetData(string key, object value, bool isForceWrite = true)
        
            logger.Info($"[SetData] Enter. Key = [key], Value = [value], isForceWrite = [isForceWrite]");


            if (DynamicData.Keys.Contains(key))
            
                string logMsg = $"DynamicData key = key has existed in context.";
                if (isForceWrite)
                
                    DynamicData[key] = value;
                
                else
                
                    logger.Debug(logMsg);
                
            
            try
            
                DynamicData.TryAdd(key, value);
            
            catch (Exception ex)
            
                logger.Error($"[SetData] ex");
            


            logger.Info($"[SetData] Enter. Key = [key], Value = [value], isForceWrite = [isForceWrite]");
        


        public static void SetData<TData>(string key, TData value, bool isForceWrite = true)
        
            SetData(key, (object)value, isForceWrite);
        




        public static TData GetData<TData>(string key)
        
            logger.Debug($"Enter [GetData]. Key = key.");


            var data = GetData(key);


            if (!(data is TData))
            
                string logMsg = $"In [GetData<TData>] DynamicData type is not [typeof(TData)].";
                logger.Error(logMsg);
                throw new Exception(logMsg);
            


            logger.Debug($"Enter [GetData]. Return ((TData)data).ToString().");


            return (TData)data;
        




        public static object GetData(string key)
        
            if (!(DynamicData.Keys.Contains(key)))
            
                string logMsg = $"In [GetData] DynamicData key = key not existed in context.";
                logger.Error(logMsg);
                throw new Exception(logMsg);
            


            object data = null;


            DynamicData.TryGetValue(key, out data);


            return data;
        


    

ConcurrentDictionary是一个线程安全的字典，它的值是object类型，每次数据写入的时候会将数据转换为object，即装箱，每次取的时候会将object类型拆箱为对应的类型。

源码下载

链接：https://pan.baidu.com/s/1kE_plpDD6-CzkjEsmtigzA

提取码：6666