Avoid hard-coded parameter names.

This makes it easier to rename the parameter in the future as we don't
have to search for the parameter name within strings.

Duplicati/Library/Compression/FileArchiveZip.cs

@@ -207,7 +207,7 @@ namespace Duplicati.Library.Compression
         public FileArchiveZip(string filename, Dictionary<string, string> options)
         {
             if (string.IsNullOrEmpty(filename) && filename.Trim().Length == 0)
-                throw new ArgumentException("Invalid filename.", "filename");
+                throw new ArgumentException("Invalid filename.", nameof(filename));
 
             if (File.Exists(filename) && new FileInfo(filename).Length > 0)
             {

Duplicati/Library/Encryption/AESEncryption.cs

@@ -71,7 +71,7 @@ namespace Duplicati.Library.Encryption
         public AESEncryption(string passphrase, Dictionary<string, string> options)
         {
             if(string.IsNullOrEmpty(passphrase))
-                throw new ArgumentException(Strings.AESEncryption.EmptyKeyError, "passphrase");
+                throw new ArgumentException(Strings.AESEncryption.EmptyKeyError, nameof(passphrase));
 
             m_key = passphrase;
 

Duplicati/Library/Main/Database/LocalListDatabase.cs

@@ -223,7 +223,7 @@ namespace Duplicati.Library.Main.Database
                     if (filter == null || filter.Empty)
                         pathprefix = "";
                     else if (filter as Library.Utility.FilterExpression == null || ((Library.Utility.FilterExpression)filter).Type != Duplicati.Library.Utility.FilterType.Simple || ((Library.Utility.FilterExpression)filter).GetSimpleList().Length != 1)
-                        throw new ArgumentException("Filter for list-folder-contents must be a path prefix with no wildcards", "filter");
+                        throw new ArgumentException("Filter for list-folder-contents must be a path prefix with no wildcards", nameof(filter));
                     else
                         pathprefix = ((Library.Utility.FilterExpression)filter).GetSimpleList().First();
 

Duplicati/Library/Main/Database/PathLookupHelper.cs

@@ -165,7 +165,7 @@ namespace Duplicati.Library.Main.Database
             public bool TryGetChild(string name, out FolderEntry v)
             {
                 if (string.IsNullOrEmpty(name))
-                    throw new ArgumentException("Invalid pathname.", "name");
+                    throw new ArgumentException("Invalid pathname.", nameof(name));
                     
                 if (m_folders == null)
                 {

Duplicati/Library/Snapshots/DefineDosDevice.cs

@@ -114,7 +114,7 @@ namespace Duplicati.Library.Snapshots
                 drive = drive.Substring(0, drive.Length - 1);
 
             if (!drive.EndsWith(":"))
-                throw new ArgumentException("The drive specification must end with a colon.", "drive");
+                throw new ArgumentException("The drive specification must end with a colon.", nameof(drive));
 
             Win32API.DDD_Flags flags = 0;
             if (!notifyShell)

Duplicati/Library/Utility/BlockingQueue.cs

@@ -157,7 +157,7 @@ namespace Duplicati.Library.Utility
             : this()
         {
             if (maxCapacity <= 0)
-                throw new ArgumentException("maxCapacity must be a positive number", "maxCapacity");
+                throw new ArgumentException("maxCapacity must be a positive number", nameof(maxCapacity));
 
             m_maxCapacity = maxCapacity;
         }

Duplicati/Library/Utility/Uri.cs

@@ -158,7 +158,7 @@ namespace Duplicati.Library.Utility
                     catch
                     {
                     }
-                throw new ArgumentException(Strings.Uri.UriParseError(url), "url");
+                throw new ArgumentException(Strings.Uri.UriParseError(url), nameof(url));
             }
                 
             this.Scheme = m.Groups["scheme"].Value;