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typeof(T) when T is dynamically created is null?


typeof(T) when T is dynamically created is null?

By : user2173297
Date : October 21 2020, 08:10 AM
it fixes the issue Since typeof(T) is a compile time operator, it unfortunately returns null when used with dynamically created types.
To get the runtime type for the generic parameter, this should still work:
code :
public static object GetData<T>(IQueryable<T> data)
{
    Type t = data.GetType().GenericTypeArguments[0];
    ...
}


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Form is Null in Dynamically created Pages

Form is Null in Dynamically created Pages


By : ashokpeeta
Date : March 29 2020, 07:55 AM
seems to work fine Look like UserControl file path is not correct.
Could you try this
code :
string path = HttpContext.Current.Request.ApplicationPath == "/" ? 
   string.Empty : HttpContext.Current.Request.ApplicationPath;

... (FormAtt)myPage.LoadControl(path + "/path/to/my/file.ascx");
Page myPage = new Page();
HtmlForm form = new HtmlForm();
FormAtt ctrl = (FormAtt)myPage.LoadControl("path/to/my/file.ascx");
form.Controls.Add(ctrl);
myPage.Controls.Add(form);
typeof (Array, null) returns object and typeof(null, Array) returns function

typeof (Array, null) returns object and typeof(null, Array) returns function


By : Keyvan
Date : March 29 2020, 07:55 AM
help you fix your problem Because
typeof is an operator, not a function, so typeof(expr) is typeof expr, with expr evaluated first a,b returns b
Dynamically Created imagebutton is null even after it has been used if app is closed and reopened

Dynamically Created imagebutton is null even after it has been used if app is closed and reopened


By : Famepram
Date : March 29 2020, 07:55 AM
may help you . You should store the id of the image that the button had on it, and then when onRestoreInstanceState is called or if you are having it recreate your activity, onCreate() is called, re-initialize the ImageButton with the id. If you loaded it dynamically the first time, you have to load it dynamically when the activity is recreated!
Have the ImageButton as a global variable.
code :
private ImageButton myImageButton;

//Code....

public void onSaveInstanceState(Bundle b){
    super.onSaveInstanceState(b);//THIS IS VERY IMPORTANT
    b.putInt("image_1", idofyourimage); //This is where you store the id of the image
    //you can store all sorts of data in the bundle, so use whatever works
    //for you.
}



public void onRestoreInstanceState(Bundle b){
    super.onRestoreInstanceState(b);//IMPORTANT
    int imageId = b.getInt("image_1");
    myImageButton = new ImageButton();
    myImageButton.setImageResource(imageId);
    //Any other stuff you need to do
}
typeof typeof x returns string and not object since type of null is object

typeof typeof x returns string and not object since type of null is object


By : Yair Schneid
Date : March 29 2020, 07:55 AM
wish helps you typeof x returns a string representation of the type of x. So, naturally, typeof typeof x is string.
From MDN:
Dynamically created views id is always null - findviewbyid not working

Dynamically created views id is always null - findviewbyid not working


By : K.anas
Date : March 29 2020, 07:55 AM
like below fixes the issue Firstly you need to set id, when you create view. Then you can try to get view's id. How to set id programmatically
It's for sure that you doing something wrong. I just tried to do what you are trying and it works. Here is my activity class RootActivity : AppCompatActivity() {
code :
override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_root)

    val layout = findViewById<LinearLayout>(R.id.root)

    val ed = EditText(this).apply {
        hint = "Type here"
        layoutParams = LinearLayout.LayoutParams(
            LinearLayout.LayoutParams.MATCH_PARENT,
            LinearLayout.LayoutParams.WRAP_CONTENT
        )
        id = View.generateViewId()
    }
    layout.addView(ed)

    val ed2 = findViewById<EditText>(ed.id)
    Log.e("MEEEEEE", ed2.toString())
}
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/root"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>
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