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im beginner to mvc. im just asking basic idea, like how.
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Dani_el wrote: im beginner to mvc. im just asking basic idea, like how.
The basic idea is to read tutorials, read articles, read books, take some classes at your local college or university. Reading how to get an answer to your question[^] might not be a bad idea either.
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Hi,
I'm writing an unmanaged application, and, am using the provided COM interfaces to invoke .NET Framework class methods. Generally, this works well, although the code is tedious to write. IPGlobalProperties is an abstract .NET class, and the GetIPGlobalProperties method is static. I am able to obtain a _MethodInfo interface pointer by invoking _Type.GetMethod_6 on the IPGlobalProperties type. Then, when I attempt to invoke _MethodInfo.Invoke_3, providing a bstr "GetIPGlobalProperties", the application crashes with an access violation. The same thing happens when I call _MethodInfo.QueryInterface, providing the IID for the _MethodBase interface (which succeeds), and, then invoking _MethodBase.Invoke_3.
I'm thinking, maybe, I should be calling: _Type.InvokeMember, or something along these lines.
Previously in my code, I had no problem obtaining a NetworkInformationPermission object by calling its constructor, and providing a NetworkInformationAccess value of read, so I'm wondering what is the reason for the access violations.
modified 31-Aug-16 17:04pm.
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0) Did you mean to say that IPGlobalProperties is a static class?
1) If you're calling IPGlobalProperties.GetIPGlobalProperties(), why aren't you referring directly to the properties contained in the return object instead of trying to find/invoke an appropriate Get method?
".45 ACP - because shooting twice is just silly" - JSOP, 2010
-
You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
-
When you pry the gun from my cold dead hands, be careful - the barrel will be very hot. - JSOP, 2013
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Hi, John,
By writing an unmanaged application, I'm actually using only COM interfaces to access .NET Framework classes. For Instance: the _Type interface All the various COM interfaces provide methods to access .NET objects, but, the syntax is different from C#. In my application, I obtain a COM interface pointer for the DefaultDomain (after loading the version 4 CLR), then, use that with the _AppDomain interface to call GetAssemblies. This returns a SAFEARRAY of _Assembly Interface pointers, which I can use to call GetTypes. Also, I can invoke: _AppDomain.Load, with an assembly Display Name, and this succeeds in loading a .NET assembly into the AppDomain. And, it goes on from there.
Anyway, once you have an interface pointer to a Type, you can call GetConstructors, which returns a SAFEARRAY of _ConstructorInfo interface pointers. In this case (IPGlobalProperties), which is an abstract class, the GetConstructors method returns a SAFEARRAY with NO interface pointers,...so, it is impossible to invoke the constructor and then call GetIPGlobalProperties with an instance of IPGlobalProperties.
...In C#, you would do this (from the NetStat .NET Framework SDK Code Sample):
IPGlobalProperties ipGlobal = IPGlobalProperties.GetIPGlobalProperties();
I don't have Visual Studio installed on my computer. But, my COM application (which I'm writing in assembly language), I would attempt to invoke GetIPGlobalProperties using: _MethodInfo.Invoke, or one of the other Invoke overloads (after invoking _Type.GetMethod, which succeeds). GetIPGlobalProperties is a static method, with no parameters, so the parameters to Invoke are NULL.
When I call it, though (_MethodInfo.Invoke), it crashes my application with an access violation.
modified 31-Aug-16 17:11pm.
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Why don't you write a "COM-visible" .Net assembly that retrieves the info you want, and expose a COM interface that allows you to retrieve the properties. I think that would be less painful than trying to coerce the .Net class directly (and you can expand the .NET assembly to provide more functionality any time you need to.
".45 ACP - because shooting twice is just silly" - JSOP, 2010
-
You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
-
When you pry the gun from my cold dead hands, be careful - the barrel will be very hot. - JSOP, 2013
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Greetings...
The problem is simple: In a ASP.NET GridView, if the property e.Row.Parent.ClientID is used in the RowDataBound event, .NET generates another identifier for the GridView, and if you had javascripts in your page that used the ClientID for the GridView, they wont work.
To replicate the problem, you have to create a WebForm with one GridView, one Client HTML Button has to access the GridView identifier like this:
<input id="Button1" type="button" value="Test" onclick="alert('The next message does not have to be null: ' + document.getElementById('<%=gridViewTest.ClientID %>'))" />
If in gridViewTest_RowDataBound you don't use the e.Row.Parent.ClientID property, everything will be fine, but if you use e.Row.Parent.ClientID for some purpose, .NET will generate another ID for the GridView and the HTML Button will not work anymore.
Is that the expected behavior, or it is a bug?
modified 24-Aug-16 10:00am.
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Is there a question in there?
This space for rent
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You're right. There was no question. My doubt is if that is just my problem or in fact it is a bug.
I added the question at the end.
Thanks for the observation.
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That seems like a bug to me. It doesn't seem as though it should be the expected behaviour.
This space for rent
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I wrote an assembly in C # that performs some function
in testing, to verify the functions, from sql server (2008 R2 64bit and windows Server 2012)
I made a small TSQ script, which performs a number of times the assembly procedures in sequence.
If you run it on a connection script is operating normally, whereas if I run the same script at the same time by two connections on one of the two in the results window appears to me the error :
"A .NET Framework error occurred during execution of an user-defined routine or aggregate "FunctioXXXX"
System.NullReferenceException: Object reference not set to instance of an object.
....."
While the other executes "normally" only with a little more slowly.
I can not understand what is the problem
The assembly can not be instantiated more than once?
It must set some options on SQLServer or some setting in the assembly code?
I searched the net ".net access multiple assembly", but did not find anything that was responsive to my problem
Thanks
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There is an error in your code.
Which we can't see.
So we can't help you to fix it.
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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You are right.
Now bring you an excerpt of code example as well as I understand reading on various forums and on msdn microsoft.
This is just one example of the assembly, but follows closely the structure of the actual rate.
I verified the functionality of the assembly first with a pgm in C # and then with SQLServer and functioning properly, but when calling the Store procedures that invoke assembly from different connections, both local and remote, as a result I have what I have written previously.
using System;
using System.Runtime.InteropServices;
using System.Text;
namespace MyNamespace
{
public class MtClassofFunction
{
private static MyLib2ExternalDllFunction.Function myLib = new MyLib2ExternalDllFunction.Function();
static public SqlIn32 MyFunction1(SqlChars szValue, SqlInt32 lValue)
{
Int32 l_value=0;
int rs=myLib.Function1(args[]);
.....
return (SqlInt32) l_value;
}
static public SqlInt32 MyFunction2(SqlInt32 lValue1, SqlInt32 lValue2)
{
Int32 rs=0;
int value=myLib.OtherFunction(args[]);
... do something
return (SqlInt32)rs;
}
}
Please help me
Thanks
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Well that code won't compile - what is args[] supposed to be?
Try marking the myLib field as readonly, in case you're inadvertently changing the reference somewhere else.
Make sure your code is thread-safe, since SQL will be calling it from multiple threads.
If you still can't find the error, then you'll need to debug your code:
Walkthrough: Debugging a SQL Server CLR Integration User-Defined Scalar Function[^]
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Hi, everyone,
For some odd reason, I cannot figure this one out.
I'm writing an unmanaged application, in assembly language. Most of the application works fine,...it's really just a big COM application for accessing .NET Framework classes by calling COM interface methods that expose these methods.
To summarize: I've done all the set-up. I've loaded the Version 4 CLR and MsCorLib in my Default Domain. I've retrieved COM pointers for several assemblies that I've loaded in the AppDomain (System, System.Core, and System.Web). I've retrieved COM pointers for various types and methods contained within the System Assembly, by first calling, _Assembly.GetTypes, and, then calling various _Type methods. This all works well.
Now, I'm at the point when I'd like to access some information from the: System.Net.NetworkInformation Namespace, which is largely contained in System Assembly. I am able to retrieve a _Type pointer to System.Net.NetworkInformation.IPGlobalProperties, and, to NetworkInformationPermission, but, I am failing to get a return from _Type.GetProperty for either of these .NET objects.
Do I need to call the constructor on these .NET objects first, before accessing properties and methods ??? Or, am I using the
Binding Flags incorrectly ??? I think I've tried every possible combination (of BindingFlags), and I still get a returned pointer with a NULL value.
I'd post some code,...but, it really is a large amount of source (most of it is irrelevant to this problem),...and, well,...it's in assembly language.
modified 19-Aug-16 17:13pm.
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Well, one class is abstract, the other is sealed; contrast that with the ones that ARE working for you.
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Line 260: newCandidate.FirstNameAR = txtFirstNameAR.Text.Trim();
Line 261: newCandidate.LastNameAR = txtLastNameAR.Text.Trim();
Line 262: newCandidate.DOB = Convert.ToDateTime(txtDOB.Text);
Line 263: newCandidate.Address = txtAddress.Text;
Line 264: newCandidate.CountryID = Convert.ToInt16(ddlCountry.SelectedValue);
Click here, for more details[^]
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Why have you posted this with a link to your QA post? Please post questions in one forum only.
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sorry for that, plz help me.
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You can't set a DateTime to null. 
".45 ACP - because shooting twice is just silly" - JSOP, 2010
-
You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
-
When you pry the gun from my cold dead hands, be careful - the barrel will be very hot. - JSOP, 2013
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That's not what I would call a reasonable practice. I prefer my DateTimes to be valid in some way (and use new DateTime(0) to accomplish that).
".45 ACP - because shooting twice is just silly" - JSOP, 2010
-
You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
-
When you pry the gun from my cold dead hands, be careful - the barrel will be very hot. - JSOP, 2013
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John Simmons / outlaw programmer wrote:
That's not what I would call a reasonable practice. |
It is a possible and valid scenario, whether you John, agree with it or not. Just saying...
For instance, shipping dates - they are usually null until something actually ships.
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