Why does var evaluate to System.Object in “foreach (var row in table.Rows)”?

That’s because the DataRowCollection class only implements the non-generic version of IEnumerable. So the compiler doesn’t know what the type of the variable is.

By explicitly putting the type in there, you basically tell the compiler to generate an explicit cast from object to DataRow.

This is a problem you’ll find with many of the collections and classes added back in the .NET 1.x days, before generics were available.

Related Posts:

  1. entity object cannot be referenced by multiple instances of IEntityChangeTracker. while adding related objects to entity in Entity Framework 4.1
  2. Invalid attempt to read when no data is present
  3. Call a stored procedure with parameter in c#
  4. Convert HTML to PDF in .NET
  5. How to show a loading gif while an APi is being called in xamarin android?
  6. C# HttpClient An existing connection was forcibly closed by the remote host
  7. IOException: The process cannot access the file ‘file path’ because it is being used by another process
  8. Error : Index was outside the bounds of the array.
  9. No connection could be made because the target machine actively refused it?
  10. What does a lock statement do under the hood?
  11. How to make the script wait/sleep in a simple way in unity
  12. Could not load file or assembly or one of its dependencies
  13. All possible array initialization syntaxes
  14. What is C# equivalent of in C++?
  15. ASP.NET 5 MVC: unable to connect to web server ‘IIS Express’
  16. Why is this code throwing an InvalidOperationException?
  17. How to add a default Default.aspx to a ASP.NET Web Application Project?
  18. Error 1053 the service did not respond to the start or control request in a timely fashion
  19. Only one usage of each socket address (protocol/network address/port) is normally permitted?
  20. Regex for numbers only
  21. Why should I use SerializeField?
  22. Access to the path is denied
  23. What does question mark and dot operator ?. mean in C# 6.0?
  24. How to jump in Unity 3d?
  25. ToList().ForEach in Linq
  26. C# List to string with delimiter
  27. Convert a list of strings to a single string
  28. Proper way to initialize a C# dictionary with values
  29. Incorrect string value: ‘\xEF\xBF\xBD’ for column
  30. How do I declare a DefaultValue attribute whose value is an array of strings?
  31. Unity3d restart current scene
  32. MSHTML DLL on Windows 10
  33. Unity 2d jumping script
  34. ..The underlying connection was closed: An unexpected error occurred on a receive
  35. How to add a delay for a 2 or 3 seconds
  36. Select distinct using linq
  37. What are Virtual Methods?
  38. Multiple file-extensions searchPattern for System.IO.Directory.GetFiles
  39. calling javascript function on OnClientClick event of a Submit button
  40. SQL Insert Query Using C#
  41. C# – Illegal characters in path
  42. Getting The ASCII Value of a character in a C# string
  43. How to round up the result of integer division?
  44. Read and parse a Json File in C#
  45. Passing just a type as a parameter in C#
  46. How to declare session variable in C#?
  47. Cannot open database “test” requested by the login. The login failed. Login failed for user ‘xyz\ASPNET’
  48. Writing data into CSV file in C#
  49. System.Data.SqlClient.SqlException: Login failed for user
  50. Error when Building Project: Error building Player because scripts have compile errors in the editor
  51. Unity3D. Trying to send command for object without authority
  52. The type initializer for ‘MyClass’ threw an exception
  53. The server committed a protocol violation. Section=ResponseStatusLine ERROR
  54. Specified cast is not valid.. how to resolve this
  55. C# switch on type
  56. C# Print list of string array
  57. finding the maximum length of lists in c#
  58. “A project with an Output type of Class Library cannot be started directly”
  59. Creating a comma separated list from IList or IEnumerable
  60. Randomize a List
  61. “A project with an Output type of Class Library cannot be started directly”
  62. Conversion of a datetime2 data type to a datetime data type results out-of-range value
  63. JSON.NET Error Self referencing loop detected for type
  64. What does ModelState.IsValid do?
  65. How to get relative path of a file in visual studio?
  66. When to use an Enum vs Struct
  67. Error Message: Type or namespace definition, or end-of-file expected
  68. Make first letter of a string upper case (with maximum performance)
  69. How to make a simple popup box in Visual C#?
  70. windows could not start service on local computer error 5 access is denied
  71. Destroy an object in C#
  72. Adding a newline into a string in C#
  73. How to format a string as a telephone number in C#
  74. How can we generate getters and setters in Visual Studio?
  75. .NET String.Format() to add commas in thousands place for a number
  76. get path for my .exe
  77. AddTransient, AddScoped and AddSingleton Services Differences
  78. Critical error detected c0000374 – C++ dll returns pointer off allocated memory to C#
  79. Linq select objects in list where exists IN (A,B,C)
  80. Fastest way to generate a random boolean
  81. need implement C# Counter
  82. Unable to determine the principal end of an association between the types
  83. What is a quick way to force CRLF in C# / .NET?
  84. What is the simplest regular expression to validate emails to not accept them blindly?
  85. The provider did not return a ProviderManifestToken string Entity Framework
  86. Why is HttpContext.Current null?
  87. Getting selected value of a combobox
  88. How do I clone a generic list in C#?
  89. Unity Scripts edited in Visual studio don’t provide autocomplete
  90. Is there a way to toggle a boolean variable in C#?
  91. Effectively use async/await with ASP.NET Web API
  92. A potentially dangerous Request.Path value was detected from the client (*)
  93. What should I use an IEnumerable or IList? [duplicate]
  94. Get single listView SelectedItem
  95. .NET Core vs Mono
  96. Add item to Listview control
  97. Windows service start failure: Cannot start service from the command line or debugger [duplicate]
  98. Displaying DateTime picker instead of Date picker in ASP .NET MVC 5.1/HTML 5 specific
  99. How to enumerate an enum
  100. How to connect to database from Unity

Leave a Comment