public static Expression Replace(InvocationExpression invocation)
{
LambdaExpression lambda = (LambdaExpression)invocation.Expression;
var replacer = new ExpressionReplacer(0.To(lambda.Parameters.Count).ToDictionaryEx(i => lambda.Parameters[i], i => invocation.Arguments[i]));
return(replacer.Visit(lambda.Body));
}
public static Expression Replace(Expression expression, ParameterExpression searchExp, ParameterExpression replaceExp)
{
var replacer = new ExpressionReplacer {
searchExp = searchExp, replaceExp = replaceExp
};
return(replacer.Visit(expression));
}
protected static Expression ModifyExpressionAndReturnResult(Expression expression, IQueryable queryableEntities, MethodCallExpression expressionToReplace, MethodInfo replacingMethod)
{
var replacingExpression = GetReplacingExpression(expressionToReplace, queryableEntities, replacingMethod);
var treeModifier = new ExpressionReplacer(expressionToReplace, replacingExpression);
return(treeModifier.Visit(expression));
}
private Expression ReplaceExpression(Expression body, Expression source, Expression dest)
{
var replacer = new ExpressionReplacer(source, dest);
return(replacer.Visit(body));
}
private static TExpression ReplaceParameter <TExpression>(TExpression expr, ParameterExpression toReplace, ParameterExpression replacement) where TExpression : Expression
{
var replacer = new ExpressionReplacer(e => e == toReplace ? replacement : e);
return((TExpression)replacer.Visit(expr));
}
public static Expression Replace(Expression expression, Dictionary <ParameterExpression, Expression> replacements)
{
var replacer = new ExpressionReplacer(replacements);
return(replacer.Visit(expression));
}
public static Expression Replace(Expression expression, ICollection <ParameterExpression> pars)
{
ExpressionReplacer replacer = new ExpressionReplacer(pars);
return(replacer.Visit(expression));
}
internal static T ReplaceParameter <T>(T expr, ParameterExpression toReplace, ParameterExpression replacement) where T : System.Linq.Expressions.Expression
{
var replacer = new ExpressionReplacer(e => e == toReplace ? replacement : e);
return((T)replacer.Visit(expr));
}