Mapping configurations - AutoMapper-users

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Message from discussion Mapping configurations
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Date: Thu, 5 Jul 2012 16:31:39 +0200
Message-ID: <CAM6HnAJ_xsrf3zQ=kGem3a+MTPWNeU2S1mkag65NLmWQaCC...@mail.gmail.com>
Subject: Mapping configurations
From: Ramon Smits <ramon.sm...@gmail.com>
To: automapper-users@googlegroups.com
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I usually try to separate the mapping code from the code that needs the
mapping. Usually I try injecting a mapping via a Func<SourceType,
DestinationType> or Action<SourceType, DestinationType> when mappings are
shared and otherwise I put the mapping config initialization in a static
constructor so that it is only run once. This makes testing more easy as I
can now test the mapping separate from the code that needs the mapping.

Furthermore, it would be nice if in a future version of automapper it would
be possible to define mappings via seperate classes. For example something
like:


	public class FromTypeAToBMapping : TypeMap<A, B>
	{
		public FromTypeAToBMapping()
		{
			ForMember(d => d.ID, o => o.Ignore());
			ForMember(d => d.BusinessNumber, o => o.MapFrom(s => s.BusinessCode));
		}
	}

	ConfigurationProvider.ImportMap(new FromTypeAToBMapping());
	ConfigurationProvider.AssertConfigurationIsValid();


I don't know if such logic is already requested of in progress but I would
like this very much!

How do others use automapper with large sets of mappings?
-- 
Ramon

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<div><br></div>I usually try to=A0separate=A0the mapping code from the code=
 that needs the mapping. Usually I try injecting a mapping via a Func&lt;So=
urceType, DestinationType&gt; or Action&lt;SourceType, DestinationType&gt; =
when mappings are shared and otherwise I put the mapping config=A0initializ=
ation=A0in a static constructor so that it is only run once. This makes tes=
ting more easy as I can now test the mapping=A0separate=A0from the code tha=
t needs the mapping.<div>
<br></div><div>Furthermore, it would be nice if in a future version of auto=
mapper it would be possible to define mappings via seperate classes. For ex=
ample something like:</div><div><br></div><div><br></div><div><pre style=3D=
"font-family:DejaVu Sans Mono;font-size:15;color:#b9bdb6;background:#1b2426=
">
	<span style=3D"background:#2f2d1d">public</span>=A0<span style=3D"backgrou=
nd:#2f2d1d">class</span>=A0<span style=3D"color:#5ba1cf">FromTypeAToBMappin=
g</span>=A0:=A0<span style=3D"color:#f0f0f0">TypeMap</span>&lt;<span style=
=3D"color:#f0f0f0">A</span>,=A0<span style=3D"color:#f0f0f0">B</span>&gt;
	{
		<span style=3D"background:#2f2d1d">public</span>=A0<span style=3D"color:#=
f0f0f0">FromTypeAToBMapping</span>()
		{
			<span style=3D"color:#f0f0f0">ForMember</span>(<span style=3D"color:#f0f=
0f0">d</span>=A0=3D&gt;=A0<span style=3D"color:#f0f0f0">d</span>.<span styl=
e=3D"color:#f0f0f0">ID</span>,=A0<span style=3D"color:#f0f0f0">o</span>=A0=
=3D&gt;=A0<span style=3D"color:#f0f0f0">o</span>.<span style=3D"color:#f0f0=
f0">Ignore</span>());
			<span style=3D"color:#f0f0f0">ForMember</span>(<span style=3D"color:#f0f=
0f0">d</span>=A0=3D&gt;=A0<span style=3D"color:#f0f0f0">d</span>.<span styl=
e=3D"color:#f0f0f0">BusinessNumber</span>,=A0<span style=3D"color:#f0f0f0">=
o</span>=A0=3D&gt;=A0<span style=3D"color:#f0f0f0">o</span>.<span style=3D"=
color:#f0f0f0">MapFrom</span>(<span style=3D"color:#f0f0f0">s</span>=A0=3D&=
gt;=A0<span style=3D"color:#f0f0f0">s</span>.<span style=3D"color:#f0f0f0">=
BusinessCode</span>));
		}
	}
=20
	<span style=3D"color:#f0f0f0">ConfigurationProvider</span>.<span style=3D"=
color:#f0f0f0">ImportMap</span>(<span style=3D"background:#2f2d1d">new</spa=
n>=A0<span style=3D"color:#f0f0f0">FromTypeAToBMapping</span>());
	<span style=3D"color:#f0f0f0">ConfigurationProvider</span>.<span style=3D"=
color:#f0f0f0">AssertConfigurationIsValid</span>();
</pre></div><div><br></div><div>I don&#39;t know if such logic is already r=
equested of in progress but I would like this very much!</div><div><div><di=
v><div><br></div><div>How do others use automapper with large sets of mappi=
ngs?</div>
-- <br><div>Ramon</div><br>
</div></div></div>

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