logo
down
shadow

Reflection PropertyInfo.GetValue(object) throwing DBNull Exception


Reflection PropertyInfo.GetValue(object) throwing DBNull Exception

By : user2955464
Date : November 22 2020, 10:40 AM
This might help you I am having a difficult time with what should be a simple bit of code. The code below loops through the properties of a custom class and gets the value from that class object and stuffs it in the data row. , You can check for null or just use null-coalescing operator:
code :
 row[p.Name] = p.GetValue(sfa) ?? DBNull.Value;


Share : facebook icon twitter icon
Reflection PropertyInfo.GetValue from Collection

Reflection PropertyInfo.GetValue from Collection


By : user2210228
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , I have problem with reflection, dynamic invoking objects and reading collection values. , Have you tried get_Item ?
code :
object oICollection = sthGetCollectionMethod.Invoke(
    sthInstance, BindingFlags.Instance | BindingFlags.Public, null,
    new object[1] { "parameter" },
    System.Globalization.CultureInfo.InvariantCulture);

object obj = tICollection.GetMethod("get_Item").Invoke(
    oICollection, new object[] { "id='1'" } );
PropertyInfo GetValue throwing error during recursion

PropertyInfo GetValue throwing error during recursion


By : Moshe
Date : March 29 2020, 07:55 AM
help you fix your problem Why are you drilling down on the type, instead of the instance?
Specifically here:
code :
  object o = pinfo.PropertyType;
  GetMyProperties(o);
  var o = pinfo.GetValue(obj, null);
  GetMyProperties(o);
PropertyInfo.GetValue(object obj, object[] index) throwing 'Target' exception

PropertyInfo.GetValue(object obj, object[] index) throwing 'Target' exception


By : Akzhol Imangaliyev
Date : March 29 2020, 07:55 AM
I hope this helps you . I need a generic list with extended search mechanism, so i have created a generic list (base List) with an addirional indexer. So in this, if T is an object, then the list allows to fetch the item based on a field. Here is the Sample code , This line of code will need to be something like this...
code :
object l_obj = l_objPropertyInfo.GetValue("Name", null);
object l_obj = l_objPropertyInfo.GetValue(this[l_nIndex], null);
PropertyInfo.GetValue(object) fails with IEnumerable<T> [C#, Reflection]

PropertyInfo.GetValue(object) fails with IEnumerable<T> [C#, Reflection]


By : user3176554
Date : March 29 2020, 07:55 AM
wish helps you This has nothing to do with the type implementing IEnumerable. Rather it's about the type having an indexer. Indexers are considered properties, but they're special properties that need to be given the parameter of the index when getting their value. If you don't, it errors as you're seeing here.
You can use GetIndexParameters() and check the count of the returned array to determine if the property is an indexer. This will let you either skip that property (which is what I assume you'll want to do here), or use it to get its values.
Reflection PropertyInfo.GetValue

Reflection PropertyInfo.GetValue


By : koala428
Date : March 29 2020, 07:55 AM
With these it helps I am new to using reflection in C#. Any help is much appreciated. , You should be able to check for 'Null' directly as follows
Related Posts Related Posts :
  • Why does C# also not allow empty conditions in while loops?
  • Unable to get a block of code into my regex match groups
  • What is difference between dbcontext.Add and dbcontext.AddObject
  • How do I update the file version number of C# DLL without recompiling?
  • Value for html control always null
  • HttpClient hangs when timeout is setting (Windows Phone)
  • Handle Multiple Form tag in asp.net page?
  • create word document with html content in c#
  • Confusion about Find And Replace
  • Format sms messages in Clickatell
  • Automated Function Overload
  • String to date in MS Access SQL statement gives type mismatch error
  • ShowDialog exiting on certain events
  • Is there a try Convert.ToInt32... avoiding exceptions
  • How to move wpf application into minimize tray at Window Start-up C#?
  • How to change display format of long variable?
  • How to use Addfields in MongoDB C# Aggregation Pipeline
  • MsTest TestCleanup method not called when an unhandled exception is thrown
  • missing last data when exporting gridview to excel
  • How to add array of objects to List in c#
  • Lambda Expression to order (sort) my list collection
  • Library for displaying music notation
  • How to compare two dictionaries in c# and get the output as True and False after validation
  • specify fields to be serialized with JSON
  • How do you obtain the content of a specific node using XmlDocument in C#?
  • How to ignore the first line in a csv file when you read the csv file in C#
  • c# - Problem calling public void from class
  • How to tell a class which objects it should create? Type vs. object confusion :(
  • Save CheckBox state to xml
  • WIX CAQuietExec NETSH Command Fails
  • Issues sending http put request every 60 seconds to RoR app
  • ConfigurationManager.ConnectionStrings.ConnectionString Issue
  • Real size WPF controls for printing
  • How to cancel properly?
  • C# String multiplication error
  • Using Solrnet and Assigning Attributes with Entity Framework Generated POCOs
  • Regex pattern for single backslash
  • TextBox: insert spaces for credit card number?
  • C# DLL loaded for exe-application is not found when launching similar DLL by rundll32.exe
  • Debug a Windows Service with WCF library
  • Open a file from an external assembly?
  • Servicestack RegistrationFeature Unable to bind request
  • Index was outside the bounds of the array confusion
  • Error in Xml to List code. The ':' character, hexadecimal value 0x3A, cannot be included in a name
  • I am trying to do a while loop with a string conditional statement in C#
  • C# 'Cannot access a disposed object. Object name: 'SslStream'.'
  • How to make Gecko use seperate CookieContainer per instance?
  • C# Advanced form "please wait"
  • Send and Receive data C# using network stream
  • How to discover that appsettings changed in C#?
  • Check what needs full trust
  • What is the execution order of an MVC Razor view/layout
  • Table designer (Entity Framework) is too resource intense
  • How to clean up an exception string so it can be displayed via Javascript Alert?
  • Configuring Amazon SES Feedback Notifications via Amazon SNS in ASP.NET MVC (C#)
  • C# api responce and request
  • Dynamodb putitem function not working properly
  • theme in windows phone(light or dark) using c#
  • Backup attached database file(.mdf) using c# and SQL Server
  • What is 'TextFile' and where it is uses in WPF project
  • shadow
    Privacy Policy - Terms - Contact Us © ourworld-yourmove.org