Open Source Entity Mapping Framework Emitmapper Introduction

Open Source Entity Mapping Framework Emitmapper Introduction

• Review

Emitmapper is an open source entity mapping Framework, Address: http://emitmapper.codeplex.com/. Emitmapper mapping efficiency is relatively high, close to hard coding. Emitmapper uses emit mode to generate IL dynamically at runtime, while other mapping frameworks use reflection mechanisms.      In addition, Emitmapper minimizes the additional calls in the unboxing and mapping process.       Emitmapper supports all platforms for. NET: Framework 3.5, Microsoft Silverlight 3, Mono. The use of Emitmapper is very simple and does not require any mapping policy to be specified. The mapping operation is done using the default mapping configurator defaultmapconfig.

1 public class Sourse
2 {
3 public int A;
4 public decimal? B
5 public string C;
6 Public Inner D;
7 public string E;
8}
9
public class Dest
11 {
public int? A
public decimal B;
Public DateTime C;
Public Inner D;
+ public string F;
17}
18
public class Inner
20 {
A public long D1;
Public Guid D2;
23}
24
Sourse src = new sourse
26 {
A = 1,
B = 0M,
C = "2011/9/21 0:00:00",
D = new Inner
31 {
D2 = Guid.NewGuid ()
33},
E = "Test"
35};
36
Panax Notoginseng objectsmapper<sourse, dest> mapper =
Objectmappermanager.defaultinstance.getmapper<sourse, dest> ();
Dest DST = mapper. MAP (SRC);
40
Assert.areequal<string> (DST. B.tostring (), Src. B);
Assert.areequal<long> (DST. C.C1, 0L);
Assert.areequal<guid> (DST. C.C2, Src. C.C2);
Assert.isnull (DST. E);

• Default Mapping Configurator

The default mapping configurator can automatically convert the following types: any type to string type using the ToString () method; You can use the original type of the System.Convert class conversion; nullable types, enum types, various collection types, structs and classes ; complex nested types are converted recursively; if the default transformation does not meet the requirements, the default mapping configurator also allows specifying naming conventions, custom constructors, custom converters, ignoring members, and so on.

Supported methods	Describe
Convertusing	Provides custom conversion logic for the specified member
Convertgeneric	Provides custom conversion logic for a specified generic type member
Constructby	Overrides the default constructor with the specified constructor for the target object
Nullsubstitution	Assigns a value to a member of the target object when the member specified in the source object is null
Ignoremembers	Ignore mappings for specified members
PostProcess	Executes the specified method after the mapping is complete
Shallowmap	The specified member is mapped in a shallow copy manner
Deepmap	The specified member is mapped in deep copy mode
Matchmembers	If the mapping of member names does not take exact matches, you can specify specific mapping logic

A simple example of selecting several methods is as follows:

1 public class Sourse
2 {
3 public int A;
4 public decimal? B
5 public string C;
6 Public Inner D;
7 public string E;
8}
9
public class Dest
11 {
public int? A
public decimal B;
Public DateTime C;
Public Inner2 D;
+ public string F;
17}
18
public class Inner
20 {
A public long D1;
Public Guid D2;
23}
24
public class Inner2
26 {
public long D12;
-Public Guid D22;
29}
30
Objectsmapper<sourse, dest> mapper1 =
New Objectmappermanager (). Getmapper<sourse, Dest> (
New Defaultmapconfig ()
34. Ignoremembers<sourse, dest> (new string[] {"A"})
35. Nullsubstitution<decimal?, decimal> ((value) = -1m)
36. Convertusing<inner, inner2> (value = new Inner2 {D12 = value). D1, D22 = value. D2})
37. Postprocess<dest> (value, state) = = {value. F = "nothing"; return value; })
38);
Dest DST = mapper1. MAP (SRC);
40
Assert.isnull (DST. A);
Assert.areequal<decimal> (DST. B, -1m);
Assert.areequal<guid> (DST. D.d22, Src. D.D2);
Assert.areequal<string> (DST. F, "nothing");

• Custom Mapping Configurator

Of course emitmapper is a very flexible framework, and you can customize the mapping configurator for custom mapping operations.       A custom mapping configurator can inherit from Defaultmapconfig or Custommapconfig, implement custom mappings with some of the functionality of the base class, or inherit from the interface Imappingconfigurator, completely from scratch. For example, you can implement the mapping of form data submitted from HTTP via post to the specific business entity class, which is implemented by inheriting Imappingconfigurator. Custom mapping configurator go from http://www.cnblogs.com/wuhong/archive/2011/09/21/2184313.html

Open Source Entity Mapping Framework Emitmapper Introduction