Bind object properties with string dynamically

Question

I have a below class

public class SearchModel
{
    public string Locations { get; set; }
    public string City { get; set; }
    public string Address { get; set; } 
    public string MaxRecord { get; set; }
    public string PageSize { get; set; }
    ....
    ....
    Approx 80 properties
}

I have a query string like "my location_Locations/new york_City/city street_Address/200_MaxRecord/20_PageSize"

Above string contains the exact property names of the class SearchModel. Now I want to do something like below:-

SearchModel model = new SearchModel();
string[] Parameters = "my location_Locations/new york_City/city street_Address/200_MaxRecord/20_PageSize".Split('/');
foreach (string item in Parameters)
{
    string[] value=item.Split('_');
    model.value[1] = value[0];
}

I would think this would open up some security concerns. If you are allowing the (untrusted internet) caller to control which variables get bound. I could for example, call /20_City/abc_PageSize/abc_SomePropertyYouDidNotPlanOnExposing/ — Philip Pittle
– Philip Pittle, Commented Jul 17, 2014 at 10:29
@ppittle: In my case, I do not care if anyone puts any non-existing property in the url, and also i am exposing all properties in the URL, so not an issue for me. But thanx for the concern. — Jitendra Pancholi
– Jitendra Pancholi, Commented Jul 17, 2014 at 10:37

AliRıza Adıyahşi · Accepted Answer · 2014-07-21 05:43:48Z

4

add following codes to your class

public class SearchModel
{
    public object this[string propertyName] 
    {
        get{
           Type myType = typeof(MyClass);                   
           PropertyInfo myPropInfo = myType.GetProperty(propertyName);
           return myPropInfo.GetValue(this, null);
        }
        set{
           Type myType = typeof(SearchModel);
            PropertyInfo myPropInfo = myType.GetProperty(propertyName);
            switch (myPropInfo.PropertyType.Name)
            {
                case "Int32":
                    myPropInfo.SetValue(this, Convert.ToInt32(value), null);
                    break;
                case "Int64":
                    myPropInfo.SetValue(this, Convert.ToInt64(value), null);
                    break;
                case "Boolean":
                    myPropInfo.SetValue(this, Convert.ToBoolean(value), null);
                    break;
                case "DateTime":
                    myPropInfo.SetValue(this, Convert.ToDateTime(value), null);
                    break;
                case "String":
                    myPropInfo.SetValue(this, value.ToString(), null);
                    break;
                default:
                    myPropInfo.SetValue(this, value, null);
                    break;
            } 
        }
    }
}

and your modified codes

SearchModel model = new SearchModel();
string[] Parameters = "my location_Locations/new york_City/city street_Address/200_MaxRecord/20_PageSize".Split('/');
foreach (string item in Parameters)
{
    string[] value= item.Split('_');
    // I changed this line
    model[value[1]] = value[0];
}

OR

SearchModel model = new SearchModel();
string[] Parameters = "my location_Locations/new york_City/city street_Address/200_MaxRecord/20_PageSize".Split('/');
foreach (string item in Parameters)
{
    string[] value= item.Split('_');

    PropertyInfo propertyInfo = model.GetType().GetProperty(value[1]);
    propertyInfo.SetValue(model, Convert.ChangeType(value[0], propertyInfo.PropertyType),
}

For case insensitive:

model.GetType().GetProperty(value[1], BindingFlags.IgnoreCase |  BindingFlags.Public | BindingFlags.Instance )

edited Jul 21, 2014 at 5:43

answered Jul 17, 2014 at 10:23

AliRıza Adıyahşi

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8 Comments

Philip Pittle Over a year ago

Is there a way to make the property name lookup case insensitive?

Jitendra Pancholi Over a year ago

@AliRızaAdıyahşi: One more thing, can we also check the datatype of the property and make the necessary type conversion?

AliRıza Adıyahşi Over a year ago

Check THIS EXAMPLE

Jitendra Pancholi Over a year ago

@AliRızaAdıyahşi: Thanks, I have modified your answer and added checks for proper datatype conversion as described in above link( which you mentioned).

AliRıza Adıyahşi Over a year ago

@JitendraPancholi, thanks, but your edit is rejected by other users, I edited again.

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