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  1. using System;
  2. using System.Linq;
  3. using System.Linq.Expressions;
  4. public class Test
  5. {
  6.     public static void Main()
  7.     {
  8.         var boolExpression = ConvertToBool<Model>(m => m.NullableBoolHere);
  9.  
  10.         // Test:
  11.         Console.WriteLine(boolExpression.Compile()(new Model(){NullableBoolHere = true } ));
  12.         Console.WriteLine(boolExpression.Compile()(new Model(){NullableBoolHere = false } ));
  13.         Console.WriteLine(boolExpression.Compile()(new Model(){NullableBoolHere = null } ));
  14.     }
  15.  
  16.     public static Expression<Func<TModel, bool>> ConvertToBool<TModel>(Expression<Func<TModel, bool?>> expression)
  17.     {
  18.         var body = Expression.Coalesce(expression.Body, Expression.Constant(false));
  19.         var boolExpression = (Expression<Func<TModel, bool>>)
  20.             Expression.Lambda(body, expression.Parameters.First());
  21.         return boolExpression;
  22.     }
  23.  
  24.     class Model
  25.     {
  26.         public bool? NullableBoolHere {get;set;}
  27.     }
  28. }
Success #stdin #stdout 0.08s 34360KB
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stdin 


			

					
			
			

				
	
		
		
	
		
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True
False
False


	

		
	 
	
	
			

					
			
			
			
			
			
			
			
			

			
			
			
		

	
		
		

			


			                        
			
			

				

	
					
					 https://ideone.com/R5rrhi
					
					
					
					
					

												

												
						
						

					

					
					
					

						
language:

						
C# (gmcs 5.20.1)

					

					

						
created:
								
						
11 years ago

					

					

						
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