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ZelWiki.Library/GuidTypeHandler.cs

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+using Dapper;
+using System.Data;
+
+namespace ZelWiki.Library
+{
+    public class GuidTypeHandler : SqlMapper.TypeHandler<Guid>
+    {
+        public override void SetValue(IDbDataParameter parameter, Guid value)
+        {
+            parameter.Value = value.ToString();
+        }
+
+        public override Guid Parse(object value)
+        {
+            return Guid.Parse((string)value);
+        }
+    }
+}