Created
September 28, 2014 00:42
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blog automapper expression
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class ParameterReplacer : ExpressionVisitor | |
{ | |
private readonly ParameterExpression _parameter; | |
private readonly Expression _replacement; | |
private ParameterReplacer(ParameterExpression parameter, Expression replacement) | |
{ | |
_parameter = parameter; | |
_replacement = replacement; | |
} | |
public static Expression Replace(Expression expression, ParameterExpression parameter, Expression replacement) | |
{ | |
return new ParameterReplacer(parameter, replacement).Visit(expression); | |
} | |
protected override Expression VisitParameter(ParameterExpression parameter) | |
{ | |
if (parameter == _parameter) | |
{ | |
return _replacement; | |
} | |
return base.VisitParameter(parameter); | |
} | |
} |
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