C# Common Code

DatePicker 控件日期格式化，可以在App.xaml.cs中添加下面代码

方法一 不推荐：

Thread.CurrentThread.CurrentCulture = (CultureInfo)Thread.CurrentThread.CurrentCulture.Clone();

Thread.CurrentThread.CurrentCulture.DateTimeFormat.ShortDatePattern = "yyyy-MM-dd";

方法二：

I have solved this problem with a help of this code. Hope it will help you all as well.

<Style TargetType="{x:Type DatePickerTextBox}">
 <Setter Property="Control.Template">
  <Setter.Value>
   <ControlTemplate>
    <TextBox x:Name="PART_TextBox"
     Text="{Binding Path=SelectedDate, StringFormat='dd MMM yyyy',
     RelativeSource={RelativeSource AncestorType={x:Type DatePicker}}}" />
   </ControlTemplate>
  </Setter.Value>
 </Setter>
</Style>

方法三：
Converter class:

public class DateFormat : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        if (value == null) return null;
        return ((DateTime)value).ToString("dd-MMM-yyyy");
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

WPF tag

<DatePicker Grid.Column="3" SelectedDate="{Binding DateProperty, Converter={StaticResource DateFormat}}" Margin="5"/>

FileHelper.cs

#region 01.读取文件方法 —— static string ReadFile(string path)
/// <summary>
/// 读取文件方法
/// </summary>
/// <param name="path">路径</param>
/// <returns>内容字符串</returns>
/// <exception cref="ArgumentNullException">路径为空</exception>
public static string ReadFile(string path)
{
#region # 验证参数

if (string.IsNullOrWhiteSpace(path))
{
throw new ArgumentNullException(nameof(path), @"路径不可为空！");
}

#endregion

StreamReader reader = null;

try
{
reader = new StreamReader(path, Encoding.UTF8);
string content = reader.ReadToEnd();
return content;
}
finally
{
reader?.Dispose();
}
}
#endregion

#region 02.写入文件方法 —— static void WriteFile(string path, string content)
/// <summary>
/// 写入文件方法
/// </summary>
/// <param name="path">路径</param>
/// <param name="content">内容</param>
/// <param name="append">是否附加</param>
/// <exception cref="ArgumentNullException">路径为空</exception>
public static void WriteFile(string path, string content, bool append = false)
{
#region # 验证参数

if (string.IsNullOrWhiteSpace(path))
{
throw new ArgumentNullException(nameof(path), "路径不可为空！");
}

#endregion

FileInfo file = new FileInfo(path);
StreamWriter writer = null;

if (file.Exists && !append)
{
file.Delete();
}
try
{
//获取文件目录并判断是否存在
string directory = Path.GetDirectoryName(path);

if (string.IsNullOrEmpty(directory))
{
throw new ArgumentNullException(nameof(path), "目录不可为空！");
}
if (!Directory.Exists(directory))
{
Directory.CreateDirectory(directory);
}

writer = append ? file.AppendText() : new StreamWriter(path, false, Encoding.UTF8);
writer.Write(content);
}
finally
{
writer?.Dispose();
}
}
#endregion

JsonHelper.cs

/// <summary>
/// JSON辅助操作类
/// </summary>
public static class JsonHelper
{
/// <summary>
/// 处理Json的时间格式为正常格式
/// </summary>
public static string JsonDateTimeFormat(string json)
{
json = Regex.Replace(json,
@"\\/Date\((\d+)\)\\/",
match =>
{
var dt = new DateTime(1970, 1, 1);
dt = dt.AddMilliseconds(long.Parse(match.Groups[1].Value));
dt = dt.ToLocalTime();
return dt.ToString("yyyy-MM-dd HH:mm:ss.fff");
});
return json;
}

/// <summary>
/// 把对象序列化成Json字符串格式
/// </summary>
/// <param name="object"></param>
/// <returns></returns>
public static string ToJson(object @object)
{
var json = JsonConvert.SerializeObject(@object);
return JsonDateTimeFormat(json);
}

/// <summary>
/// 把Json字符串转换为强类型对象
/// </summary>
public static T FromJson<T>(string json)
{
json = JsonDateTimeFormat(json);
return JsonConvert.DeserializeObject<T>(json);
}
}

WPF下载文件

WPF下载远程文件，并显示进度条和百分比

 

WPF下载远程文件，并显示进度条和百分比

1、xaml

<ProgressBar HorizontalAlignment="Left" Height="10" Margin="96,104,0,0" Name="pbDown" VerticalAlignment="Top" Width="100"/>

<Label Content="Label" Name="label1" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="206,104,0,0"/>

2、CS程序

using System;

using System.Windows;

using System.Windows.Controls;

using System.Net;

using System.IO;

using System.Threading;

using System.Drawing;

 

namespace WpfDemo

{

    /// <summary>

    /// MainWindow.xaml 的交互逻辑

    /// </summary>

    public partial class MainWindow : Window

    {

        public MainWindow()

        {

            InitializeComponent();

            if (HttpFileExist("http://183.62.138.31:57863/opt/resources/%E9%A3%8E%E6%99%AF/f1.jpg"))

            {

                DownloadHttpFile("http://183.62.138.31:57863/opt/resources/%E9%A3%8E%E6%99%AF/f1.jpg", @"d:\f1.jpg");

            }

        }

        public void DownloadHttpFile(String http_url, String save_url)

        {

            WebResponse response = null;

            //获取远程文件

            WebRequest request = WebRequest.Create(http_url);

            response = request.GetResponse();

            if (response == null) return;

            //读远程文件的大小

            pbDown.Maximum = response.ContentLength;

            //下载远程文件

            ThreadPool.QueueUserWorkItem((obj) =>

            {

                Stream netStream = response.GetResponseStream();

                Stream fileStream = new FileStream(save_url, FileMode.Create);

                byte[] read = new byte[1024];

                long progressBarValue = 0;

                int realReadLen = netStream.Read(read, 0, read.Length);

                while (realReadLen > 0)

                {

                    fileStream.Write(read, 0, realReadLen);

                    progressBarValue += realReadLen;

                    pbDown.Dispatcher.BeginInvoke(new ProgressBarSetter(SetProgressBar), progressBarValue);

                    realReadLen = netStream.Read(read, 0, read.Length);

                }

                netStream.Close();

                fileStream.Close();

 

            }, null);

        }       

        /// <summary>

        ///  判断远程文件是否存在

        /// </summary>

        /// <param name="fileUrl">文件URL</param>

        /// <returns>存在-true，不存在-false</returns>

        private bool HttpFileExist(string http_file_url)

        {

            WebResponse response = null;

            bool result = false;//下载结果

            try

            {

                response = WebRequest.Create(http_file_url).GetResponse();

                result = response == null ? false : true;

            }

            catch (Exception ex)

            {

                result = false;

            }

            finally

            {

                if (response != null)

                {

                    response.Close();

                }

            }

            return result;

        }

        public delegate void ProgressBarSetter(double value);

        public void SetProgressBar(double value)

        {

            //显示进度条

            pbDown.Value = value;

            //显示百分比

            label1.Content = (value / pbDown.Maximum) * 100 + "%";

        }

    }

}