public static ConditionPredicate <T> GetConditionPredicate <T>(string fieldName, ExpressionOperator expressionOperator, string value)
{
var itemType = typeof(T);
var predParam = Expression.Parameter(itemType, "Target");
var propertyInfo = itemType.GetProperty(fieldName);
Expression left = Expression.Property(predParam, propertyInfo);
Expression right = Expression.Constant(ObjectTypeConverter.ChangeType(value, propertyInfo.PropertyType), propertyInfo.PropertyType);
var result = GetExpression(expressionOperator, left, right);
var function = (Func <T, bool>)Expression.Lambda(result, predParam).Compile();
return(new ConditionPredicate <T>(function));
}
public static Delegate GetActionPredicate <T>(string fieldName, ExpressionOperator expressionOperator, string value)
{
var itemType = typeof(T);
var parameterExpression = Expression.Parameter(itemType, "Target");
var propertyInfo = itemType.GetProperty(fieldName);
Expression left = Expression.Property(parameterExpression, propertyInfo);
Expression right = Expression.Constant(ObjectTypeConverter.ChangeType(value, propertyInfo.PropertyType), propertyInfo.PropertyType);
var result = GetExpression(expressionOperator, left, right);
var function = Expression.Lambda(result, parameterExpression).Compile();
return(function);
}