添加对 Core 的直接引用

RhythmBaseCore/Exceptions/VersionTooLowException.cs

@@ -0,0 +1,39 @@
+namespace RhythmBase.Exceptions
+{
+	/// <summary>
+	/// Exception thrown when the version is too low.
+	/// </summary>
+	public class VersionTooLowException : RhythmBaseException
+	{
+		/// <summary>
+		/// Gets the error message.
+		/// </summary>
+		public override string Message { get; }
+
+		/// <summary>
+		/// Gets the level version that caused the exception.
+		/// </summary>
+		public int LevelVersion;
+
+		/// <summary>
+		/// Initializes a new instance of the <see cref="VersionTooLowException"/> class with the specified version.
+		/// </summary>
+		/// <param name="version">The version that is too low.</param>
+		public VersionTooLowException(int version)
+		{
+			Message = string.Format("Might not support. The version {0} is too low. Save this level with the latest version of the game to update the level version.", LevelVersion);
+			LevelVersion = version;
+		}
+
+		/// <summary>
+		/// Initializes a new instance of the <see cref="VersionTooLowException"/> class with the specified version and inner exception.
+		/// </summary>
+		/// <param name="version">The version that is too low.</param>
+		/// <param name="innerException">The exception that is the cause of the current exception.</param>
+		public VersionTooLowException(int version, Exception innerException) : base(string.Empty, innerException)
+		{
+			Message = string.Format("Might not support. The version {0} is too low. Save this level with the latest version of the game to update the level version.", version);
+			LevelVersion = version;
+		}
+	}
+}