添加项目文件。

SMMS_Downloader.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.8.34205.153
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SMMS_Downloader", "SMMS_Downloader\SMMS_Downloader.csproj", "{3B72077F-D778-4489-A066-2A84BD8D63A9}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{3B72077F-D778-4489-A066-2A84BD8D63A9}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{3B72077F-D778-4489-A066-2A84BD8D63A9}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{3B72077F-D778-4489-A066-2A84BD8D63A9}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{3B72077F-D778-4489-A066-2A84BD8D63A9}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {6013876C-A5E5-4AB8-849C-B302407F85CE}
+	EndGlobalSection
+EndGlobal

SMMS_Downloader/App.xaml

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+<Application
+    x:Class="SMMS_Downloader.App"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="clr-namespace:SMMS_Downloader"
+    StartupUri="MainWindow.xaml">
+    <Application.Resources />
+</Application>

SMMS_Downloader/App.xaml.cs

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+using System.Configuration;
+using System.Data;
+using System.Windows;
+
+namespace SMMS_Downloader
+{
+    /// <summary>
+    /// Interaction logic for App.xaml
+    /// </summary>
+    public partial class App : Application
+    {
+    }
+
+}

SMMS_Downloader/AssemblyInfo.cs

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+using System.Windows;
+
+[assembly: ThemeInfo(
+    ResourceDictionaryLocation.None,            //where theme specific resource dictionaries are located
+                                                //(used if a resource is not found in the page,
+                                                // or application resource dictionaries)
+    ResourceDictionaryLocation.SourceAssembly   //where the generic resource dictionary is located
+                                                //(used if a resource is not found in the page,
+                                                // app, or any theme specific resource dictionaries)
+)]

SMMS_Downloader/Converters/StateToBrushConverter.cs

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+using SMMS_Downloader.ViewModels;
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Data;
+using System.Windows.Media;
+
+namespace SMMS_Downloader.Converters
+{
+    public class StateToBrushConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            TaskState state = (TaskState)value;
+            switch(state)
+            {
+                case TaskState.Wait:
+                    return new SolidColorBrush(Color.FromArgb(50, 3, 169, 244));
+                case TaskState.Downloading:
+                    return new SolidColorBrush(Color.FromArgb(50, 63, 81, 181));
+                case TaskState.Error:
+                    return new SolidColorBrush(Color.FromArgb(50, 244, 67, 54));
+                case TaskState.Done:
+                    return new SolidColorBrush(Color.FromArgb(50, 76, 175, 80));
+            }
+            return "";
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}

SMMS_Downloader/Converters/StateToTextConverter.cs

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+using SMMS_Downloader.ViewModels;
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Data;
+
+namespace SMMS_Downloader.Converters
+{
+    public class StateToTextConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            TaskState state = (TaskState)value;
+            switch(state)
+            {
+                case TaskState.Wait:
+                    return "⏱️";
+                case TaskState.Downloading:
+                    return "▶️";
+                case TaskState.Error:
+                    return "❌";
+                case TaskState.Done:
+                    return "✅";
+            }
+            return "";
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}

SMMS_Downloader/Extensions/FileSizeExtension.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SMMS_Downloader.Extensions
+{
+    public static class FileSizeExtension
+    {
+        public const long ChunkSize = 4 * 1024 * 1024;
+
+        public static string PrettyPrint(this long value)
+        {
+            if (value < 0) throw new Exception("WTF???");
+            double v = value;
+            if (v < 1024)
+            {
+                return $"{value} Bytes";
+            }
+            else v = v / 1024;
+            if (v < 1024)
+            {
+                return $"{v.ToString("f2")} KB";
+            }
+            else v = v / 1024;
+            if (v < 1024)
+            {
+                return $"{v.ToString("f2")} MB";
+            }
+            else v = v / 1024;
+            if (v < 1024)
+            {
+                return $"{v.ToString("f2")} GB";
+            }
+            else v = v / 1024;
+            if (v < 1024)
+            {
+                return $"{v.ToString("f2")} TB";
+            }
+            else v = v / 1024;
+            throw new Exception("WTF???");
+        }
+
+        public static int GetChunkCount(this long size)
+        {
+            var chunkCount = (int)(size / ChunkSize);
+            chunkCount += chunkCount * ChunkSize == size ? 0 : 1;
+            if (size == 0)
+                chunkCount = 1;
+            return chunkCount;
+        }
+    }
+}

SMMS_Downloader/Extensions/PasswordBoxExt.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using Microsoft.Xaml.Behaviors;
+
+namespace SMMS_Downloader.Extensions
+{
+    public class PassWordExtensions
+    {
+        public static string GetPassWord(DependencyObject obj)
+        {
+            return (string)obj.GetValue(PassWordProperty);
+        }
+
+        public static void SetPassWord(DependencyObject obj, string value)
+        {
+            obj.SetValue(PassWordProperty, value);
+        }
+
+        public static readonly DependencyProperty PassWordProperty =
+            DependencyProperty.RegisterAttached("PassWord", typeof(string), typeof(PassWordExtensions), new FrameworkPropertyMetadata(string.Empty, OnPassWordPropertyChanged));
+
+        static void OnPassWordPropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
+        {
+            var passWord = sender as PasswordBox;
+            string password = (string)e.NewValue;
+
+            if (passWord != null && passWord.Password != password)
+                passWord.Password = password;
+        }
+    }
+
+    public class PasswordBehavior : Behavior<PasswordBox>
+    {
+        protected override void OnAttached()
+        {
+            base.OnAttached();
+            AssociatedObject.PasswordChanged += AssociatedObject_PasswordChanged;
+        }
+
+        private void AssociatedObject_PasswordChanged(object sender, RoutedEventArgs e)
+        {
+            PasswordBox passwordBox = sender as PasswordBox;
+            string password = PassWordExtensions.GetPassWord(passwordBox);
+
+            if (passwordBox != null && passwordBox.Password != password)
+                PassWordExtensions.SetPassWord(passwordBox, passwordBox.Password);
+        }
+
+        protected override void OnDetaching()
+        {
+            base.OnDetaching();
+            AssociatedObject.PasswordChanged -= AssociatedObject_PasswordChanged;
+        }
+    }
+}

SMMS_Downloader/Helpers/LaunchHelper.cs

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+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SMMS_Downloader.Helpers
+{
+    public static class LaunchHelper
+    {
+        public static void OpenURL(string url)
+        {
+            var psi = new ProcessStartInfo
+            {
+                FileName = url,
+                UseShellExecute = true
+            };
+            Process.Start(psi);
+        }
+    }
+}