Month: February 2015

How to get return Value from method invocation using reflection in C# and VB.NET

 

To get return Value from method invocation using reflection in C# and VB.NET you can use the snippet below.

Sample C#

var returnValue = (Int32)methodInfo.Invoke(null,null); //just cast the returned object of Invoke to the needed Type. Theres no difference if it is a static method/class or not

Sample VB.NET

Dim returnValue = DirectCast(methodInfo.Invoke(Nothing, Nothing), Int32) 'just cast the returned object of Invoke to the needed Type. Theres no difference if it is a static method/class or not

For more informations on how to invoke methods from other assemblies using reflection see:

  • How to call a static method in different assembly using Reflection in C# and VB.NET
  • How to call a non-static method in different assembly using Reflection in C# and VB.NET

    • How to call a non-static method in different assembly using Reflection in C# and VB.NET

     

    To call a static method in different assembly using Reflection in C# and VB.NET you can use the snippet below.

    Sample C#

    Assembly assembly = Assembly.LoadFile(@"Assembly_Location");   
var type = assembly.Types().FirstOrDefault(x => x.FullName.Contains("MyClassName"));
var constructor = type.GetConstructor(Type.EmptyTypes);

var classObject = constructor.Invoke(new object[] { }); //call parameterless constructor
var classObject = constructor.Invoke(new object[] { param1 }); //call non-parameterless constructor

MethodInfo methodInfo = type.GetMethod("MyMethodName");
methodInfo.Invoke(classObject, new object[] { }); //pass classobject, parameterless method
methodInfo.Invoke(classObject, new object[] { param1 }); //pass classobject, parameterized method

    Sample VB.NET

    Dim assembly__1 As Assembly = Assembly.LoadFile("Assembly_Location")
Dim type__2 = assembly__1.Types().FirstOrDefault(Function(x) x.FullName.Contains("MyClassName"))
Dim constructor = type__2.GetConstructor(Type.EmptyTypes)

Dim classObject = constructor.Invoke(New Object() {})'call parameterless constructor
Dim classObject = constructor.Invoke(New Object() {param1})'call non-parameterless constructor

Dim methodInfo As MethodInfo = type__2.GetMethod("MyMethodName")
methodInfo.Invoke(classObject, New Object() {})'pass classobject, parameterless method
methodInfo.Invoke(classObject, New Object() {param1})'pass classobject, parameterized method

    How to call a static method in different assembly using Reflection in C# and VB.NET

     

    To call a static method in different assembly using Reflection in C# and VB.NET you can use the snippet below.

    Sample C#

    Assembly assembly = Assembly.LoadFile(@"Assembly_Location"); 
var t = assembly.Types().FirstOrDefault(x=>x.FullName.Contains("MyClassName"));
var method = t.GetMethod("MyMethodName", BindingFlags.Public | BindingFlags.Static);
method.Invoke(null, null); //assuming that the method does not have parameters
method.Invoke(null, new object[] { param1}); //assuming that the method has 1 parameter

    Sample VB.NET

    Dim assembly__1 As Assembly = Assembly.LoadFile("Assembly_Location")
Dim t = assembly.Types().FirstOrDefault(Function(x) x.FullName.Contains("MyClassName"))
Dim method = t.GetMethod("MyMethodName", BindingFlags.[Public] Or BindingFlags.[Static])
method.Invoke(Nothing, Nothing) 'assuming that the method does not have parameters
method.Invoke(Nothing, New Object() {param1}) 'assuming that the method has 1 parameter

    How to use substring in IOS using Objective-C

     

    To use substring in IOS using Objective-C you can use the snippet below.

    Sample Objective-C

    NSString *myString = @"http://codesnippets.fesslersoft.de";
NSString *myNewString = [myString substringFromIndex:7]; //myNewString will be "codesnippets.fesslersoft.de"

    How to autosize UILabel to Textsize in IOS using Objective-C

     
    labelTest.text = @"This is my Teststring.This is my Teststring.This is my Teststring.This is my Teststring.This is my Teststring.This is my Teststring.";
labelTest.numberOfLines = 0;
[labelTest sizeToFit];

    How to clear notifications in IOS using Objective-C

     

    To clear notifications in IOS using objective-c you can use the snippet below.

    Sample Objective-C

    //in method: application:didFinishLaunchingWithOptions
[[UIApplication sharedApplication] setApplicationIconBadgeNumber: 0];
[[UIApplication sharedApplication] cancelAllLocalNotifications];

//in method: application:didReceiveRemoteNotification
[[UIApplication sharedApplication] setApplicationIconBadgeNumber: 1]; //we need to to increment first
[[UIApplication sharedApplication] setApplicationIconBadgeNumber: 0];
[[UIApplication sharedApplication] cancelAllLocalNotifications];

    How to show software keyboard when focusing textedit in Android

     

    To show software keyboard when focusing textedit in Android you can use the snippet below.

    Sample Java

    myTextEdit.setOnFocusChangeListener(new View.OnFocusChangeListener() {
    @Override
    public void onFocusChange(View view, boolean focus) {
        if (focus) {
            dialog.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE);
        }
    }
});

    How to create an alert dialog in Android

     

    To create an alert dialog in Android you can use the following snippet.

    Sample Java

    new AlertDialog.Builder(this)
    .setTitle("Delete items")
    .setMessage("Are you sure you want to delete this items?")
    .setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) { 
            // YES
        }
     })
    .setNegativeButton(android.R.string.no, new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) { 
            // NO
        }
     })
    .setIcon(android.R.drawable.ic_dialog_alert)
     .show();