c# - How can I set default value to exceptions in automapper while mapping from string to int type property? -


i trying map 1 object getting problem while mapping empty string type int or non integer string int, want if such exceptions occur must assign default value it, let -1.

for example have class a , class b

 class  {      public string a{get;set;}  }  class b  {      public int a{get;set;}  }

now if map class a b using default rule through exception if string empty or non integer.

please me fix problem.

thanks in advance.

i think you're after. 

using system; using system.collections.generic; using system.linq; using system.text; using system.threading.tasks; using automapper; using nunit.framework;  namespace stackoverflowanswers {     public class lineitem     {         public int id { get; set; }         public string productid { get; set; }         public int amount { get; set; }     }      public class model     {         public int id { get; set; }         public string productid { get; set; }         public string amount { get; set; }     }       public class automappingtests     {         [testfixturesetup]         public void testfixturesetup()         {             mapper.createmap<model, lineitem>()                   .formember(x => x.amount, opt => opt.resolveusing<stringtointeger>());         }          [test]         public void testbadstringtodefaultinteger()         {             // arrange             var model = new model() {id = 1, productid = "awesome-product-133-xp", amount = "evil string, mwuahahahah"};              // act             lineitem mapping1 = mapper.map<lineitem>(model);              // assert             assert.areequal(model.id, mapping1.id);             assert.areequal(model.productid, mapping1.productid);             assert.areequal(0, mapping1.amount);               // arrange             model.amount = null; // test null, said in options map null -1              // act             lineitem mapping2 = mapper.map<lineitem>(model);              // assert             assert.areequal(-1, mapping2.amount);          }      }      public class stringtointeger : valueresolver<model, int>     {         protected override int resolvecore(model source)         {             if (source.amount == null)             {                 return -1;             }              int value;              if (int.tryparse(source.amount, out value))             {                 return value; // wahayy!!             }              return 0; // return 0 if not parse!         }     } }

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