I have a database object (a row), that has lots of properties (columns) that map to form fields (asp:textbox, asp:dropdownlist etc) . I would like to transform this object and properties into a dictionary map to make it easier to iterate.
Example:
Dictionary<string, string> FD = new Dictionary<string,string>();
FD["name"] = data.name;
FD["age"] = data.age;
FD["occupation"] = data.occupation;
FD["email"] = data.email;
..........
How would I do this easily, without manually typing out all the various 100s of properties?
Note: FD dictionary indices are same as database column names.
Assuming that data
is some object and that you want to put its public properties into a Dictionary then you could try:
Original - here for historical reasons (2012) :
Dictionary<string, string> FD = (from x in data.GetType().GetProperties() select x)
.ToDictionary (x => x.Name, x => (x.GetGetMethod().Invoke (data, null) == null ? "" : x.GetGetMethod().Invoke (data, null).ToString()));
Updated (2017) :
Dictionary<string, string> dictionary = data.GetType().GetProperties()
.ToDictionary(x => x.Name, x => x.GetValue(data)?.ToString() ?? "");
The HtmlHelper class allows a conversion of Anonymouns Object to RouteValueDictonary and I suppose you could use a .ToString() on each value to get the string repersentation:
var linkAttributes = System.Web.Mvc.HtmlHelper.AnonymousObjectToHtmlAttributes(linkHtmlAttributes);
The down side is this is part of the ASP.NET MVC Framework. Using a .NET Reflector, the code inside of the method is as follows:
public static RouteValueDictionary AnonymousObjectToHtmlAttributes(object htmlAttributes)
{
RouteValueDictionary dictionary = new RouteValueDictionary();
if (htmlAttributes != null)
{
foreach (PropertyDescriptor descriptor in TypeDescriptor.GetProperties(htmlAttributes))
{
dictionary.Add(descriptor.Name.Replace('_', '-'), descriptor.GetValue(htmlAttributes));
}
}
return dictionary;
}
You'll see that this code is identical to the answer Yahia gave you, and his answer provides a Dictonary<string,string>. With the reflected code I gave you you could easily convert a RouteValueDictionary to Dictonary<string,string> but Yahia's answer is a one liner.
EDIT - I've added the code for what could be a method to do your conversion:
EDIT 2 - I've added null checking to the code and used String.Format for the string value
public static Dictionary<string, string> ObjectToDictionary(object value)
{
Dictionary<string, string> dictionary = new Dictionary<string, string>();
if (value != null)
{
foreach (System.ComponentModel.PropertyDescriptor descriptor in System.ComponentModel.TypeDescriptor.GetProperties(value))
{
if(descriptor != null && descriptor.Name != null)
{
object propValue = descriptor.GetValue(value);
if(propValue != null)
dictionary.Add(descriptor.Name,String.Format("{0}",propValue));
}
}
return dictionary;
}
And to go from a Dictionary to an object check http://automapper.org/ which was suggested in this thread Convert dictionary to anonymous object
var myDict = myObj.ToDictionary(); //returns all public fields & properties
.
public static class MyExtensions
{
public static Dictionary<string, object> ToDictionary(this object myObj)
{
return myObj.GetType()
.GetProperties()
.Select(pi => new { Name = pi.Name, Value = pi.GetValue(myObj, null) })
.Union(
myObj.GetType()
.GetFields()
.Select(fi => new { Name = fi.Name, Value = fi.GetValue(myObj) })
)
.ToDictionary(ks => ks.Name, vs => vs.Value);
}
}
Take a look at System.ComponentModel.TypeDescriptor.GetProperties( ... )
. This is the way the normal data binding bits work. It will use reflection and return you a collection of property descriptors (which you can use to get the values). You can customize these descriptors for performace by implementing ICustomTypeDescriptor
.
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