Fixed several crashes with spamming pause and resume functions.

AltoHttp/AltoHttp.csproj

@@ -8,7 +8,7 @@
     <OutputType>Library</OutputType>
     <RootNamespace>AltoHttp</RootNamespace>
     <AssemblyName>AltoHttp</AssemblyName>
-    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
     <AppDesignerFolder>Properties</AppDesignerFolder>
     <TargetFrameworkProfile />
   </PropertyGroup>

AltoHttp/HttpDownloader.cs

@@ -208,8 +208,11 @@ public void Start()
         /// </summary>
         public void Pause()
         {
-            allowDownload = false;
-            downloadThread.Interrupt();
+            if (State != Status.Paused && State == Status.Downloading)
+            {
+                allowDownload = false;
+                downloadThread.Interrupt();
+            }
         }
         /// <summary>
         /// Stops the download, deletes the downloaded file and resets the download
@@ -232,23 +235,25 @@ public void StopReset()
         /// <param name="fileToResume">The filepath to continue</param>
         public void Resume(string fileToResume, string validationChecksum)
         {
-            LastMD5Checksum = validationChecksum;
-            if (State != Status.Paused && State != Status.ErrorOccured)
-                throw new Exception("Resume is enabled only when not downloading");
-            var file = new FileInfo(fileToResume);
-            TotalBytesReceived = file.Length;
-            if (fileToResume != FullFileName)
-                File.Move(fileToResume, FullFileName);
-            Start();
+            if (State == Status.Paused)
+            {
+                LastMD5Checksum = validationChecksum;
+                if (State != Status.Paused && State != Status.ErrorOccured)
+                    throw new Exception("Resume is enabled only when not downloading");
+                var file = new FileInfo(fileToResume);
+                TotalBytesReceived = file.Length;
+                if (fileToResume != FullFileName)
+                    File.Move(fileToResume, FullFileName);
+                Start();
+            }
         }
         /// <summary>
         /// Continues from where the file left
         /// </summary>
         public void Resume()
         {
-            if (State != Status.Paused && State != Status.ErrorOccured)
-                throw new Exception("Resume is enabled only when not downloading");
-            Start();
+            if (State == Status.Paused)
+                Start();
         }
         /// <summary>
         /// Gets the total bytes downloaded

DemoApplication/DemoApplication.csproj

@@ -9,7 +9,7 @@
     <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>DemoApplication</RootNamespace>
     <AssemblyName>DemoApplication</AssemblyName>
-    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <TargetFrameworkProfile />
   </PropertyGroup>
@@ -73,6 +73,7 @@
       <DependentUpon>Resources.resx</DependentUpon>
       <DesignTime>True</DesignTime>
     </Compile>
+    <None Include="app.config" />
     <None Include="packages.config" />
     <None Include="Properties\Settings.settings">
       <Generator>SettingsSingleFileGenerator</Generator>