doesn't actually set the value...

Hot Topic

A Question of CLR Profiler Source Code
SOAP Exception, xml key problem
Excel from a web page
How do I send mail using C#?
Serialize Strong Typed Collection. "There was an error reflecting type.."
Datareader to object relationship/mapping.
FtpWebRequest method=Create Directory problem with "#" in the directory name.
Winform accessing to a xml file in shared folder
Webservice: "The ASP.NET process identity does not have read permissions to the global assembly cache."
How to keen network connection active indefinitely

.NET Development

web service does not work on webserver only on local box!
StackOverflowException thrown when add a soapExtension
Wrapper doesn't work
passing WindowsPrincipal across layer and some quest about remoting
CAS: Set zone security without wizard
XML Commenting
Online artwork design
Javascript functions to know mouse coordinates?
" is not a valid Win32 application ??!
Click Event for Member of Label Array

doesn't actually set the value...

I was given the following code to set a value in an object from a string like "Header.field.str".  It seems to function correctly but never sets the value.  Any help is much appreciated...


public static void SetValue(object baseObj, string fieldName, object value)

{

MemberInfo member = null; //The current field/property matched

Type typeCurr = baseObj.GetType(); //The current type of the field/property matched

object data = baseObj; //The previous object/property that matched

string[] names = fieldName.Split('.');

foreach (string name in names)

{

//We are still going so get the current data object that we might

//need to set

if (member is PropertyInfo)

data = ((PropertyInfo)member).GetValue(data, null);

else if (member is FieldInfo)

data = ((FieldInfo)member).GetValue(data);

//Find the next property/field

PropertyInfo prop = typeCurr.GetProperty(name);

if (prop != null)

{

typeCurr = prop.PropertyType;

member = prop;

}

else //Not a property so try the fields

{

FieldInfo field = typeCurr.GetField(name);

if (field != null)

{

typeCurr = field.FieldType;

member = field;

};

};

};

// if (member is FieldInfo)

// data = ((FieldInfo)member).GetValue(data);

if (member is PropertyInfo)

{

((PropertyInfo)member).SetValue(data, value, null);

}

else

{

//((FieldInfo)member).SetValue(data, value);

((FieldInfo)member).SetValue(data, value);

};

}


 

Answer this question

doesn't actually set the value...

  • hrh

    I might be missing something but I think all you need to do is this:


    baseObj.GetType().InvokeMember(name, 
                BindingFlags.Public | BindingFlags.NonPublic | 
                BindingFlags.SetField | BindingFlags.Static,
                null, baseobj, new object[] {value});
     

  • ScottLeo

    you mean like a nested class property -


    public class AClass
    {
       public Nested
       {
          int nestedInt
       }
       int baseInt;
    }
     


    sounds like a need for recursion on the same method - do you need me to elaborate more

  • RedHedToo

    Yes please, I've tried recursion using type and fieldinfo and getvalue, but what I've found is that getvalue doesn't return a reference to the actuall object but rather a new object.  So when I set the value of object, it doesn't set the original object's value.

    Thanks,

    Devin

  • cllard

    Thanks,  It works if your setting a value that's in the objects member scope, but if it's nested within on of the members then it fails.

  • Adam Friedman

    OK perhaps a better question is to ask, does anybody know how to set an objects value using reflection

  • Jakin

    OK, I finally figured it out...



    public static object GetValue(object obj, string path)

    {

    return TraverseObjectValue(obj, path.Split('.'), null);

    }

    public static void SetValue(object obj, string path, object value)

    {

    object o = TraverseObjectValue(obj, path.Split('.'), value);

    }

    public static object TraverseObjectValue(object lastobj, string[] paths, object value)

    {

    Type t = lastobj.GetType();

    FieldInfo f = t.GetField(paths[0]);

    object o = f.GetValue(lastobj);

    if (paths.GetLength(0) > 1)//if not at end value

    {

    string[] p = new string[paths.GetUpperBound(0)];

    for (int i = 1; i < paths.GetLength(0); i++)

    p[i - 1] = pathsIdea;

    object oo = TraverseObjectValue(o, p, value);

    if (value != null)

    f.SetValue(lastobj, o);

    return oo;

    }

    else//if at end value

    {

    if (value != null)

    f.SetValue(lastobj, value);

    return o;

    }

    }


     


    I figured out that obtaining the object from the field was creating a new object instead of a reference.  You'll see that I assigned the newly created object to the parent object to allow for the recursion.
  • doesn't actually set the value...
Answer this question