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You need to submit the JavaScript string so that the server (aka C#) has access to it in the post-back. Try adding a TextBox and setting it using JavaScript. Then, when you submit the form, you should get the new value.
Michael Flanakin
Web Log
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Parsing a html document in C# using mshtml object works very slow.
Why is this happening ? Is it possible to avoid it ?
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We haven't seen this. Have you run your code through a profiler? Perhaps there's something on your end causing the problem.
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What do you mean by a profiler ?
I have made a test end code - a code that simply gets recursively all children of each node and that runs through each attribute of each node. Even very simple html pages run in 1-2 seconds. However the same pages, with the same algorithms, run instantly on VB6 or VC++ 6.
Can you provide me a simple C# project that does the same thing and runs instantly on html pages of medium complexity ?
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Go download the ANTS profiler trial[^], run your project with it, and it'll tell you what's taking time.
My guess is one of 3 things; you're modifying the DOM document (which is not too fast), or there's a bug in the interop assembly (microsoft.mshtml.dll), or you're not caching your references to the DOM objects. Run a profiler and see what's taking up time.
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1. The program doesn't modify the DOM for sure.
2. Probably there's a bug in the interop.
3. I am caching the reference to DOM objects (i.e. access the objects always through a local object).
I have made a simple COM in VB6 that takes as input a HTMLDocument object and runs the same algorithm as the one written in C#. If it's run by a VB6 program - it runs very fast.
If it's run by C# - then it runs slowly, similar to C# code. But ! if the VB6 com receives the URL of the page, loads it itself and then calls the function that parses it - then it works very fast again.
I think this is due to some kind of .NET object wrapper.
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I have run the profiler. The biggest part of the time is spent on accessing/enumerating (with Foreach, or with IEnumerator) all children or all attributes of each node.
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Try enumerating them with a regular for loop. Also, cache references to these if you're accessing them multiple times. You may also want to profile mshtml.dll when you run this to see if there's anything odd going on there.
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I am sure that if there's something wrong, then it's wrong with the mshtml.dll . As I said before, if I run a VB6 COM that uses the HTMLDocument from C# (received as a parameter to its function) - then it runs slowly, but if the VB6 COM doesn't take the C# HTMLDocument (load the page itself) - then it runs fast.
How to run the profiler on mshtml.dll ?
As you said at the beginning - you didn't encounter such things as slow running. Have you made a similar module or code that parses a HTMLDocument object using mshtml ? If so - what VS.NET did you use , and on what windows ?
Thanks.
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When you run the profiler (assuming you're running Ants profiler), in the profiler wizard, select "Profile all .NET methods", which should give you some results on MSHTML.
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I've tried to access the nodes by indexes (not through enumeration) - doesn't help much.
Ran the profiler on mshtml.dll too, and it showed that most time is spent on accessing the attributes and children of nodes.
Thus there's only one possible reason - either .NET works slowly when accessing mshtml elements, either the mshtml is generated wrong (which I doubt).
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This is the C# code that I used for tests (doc is a HTMLDocument variable):
ArrayList nodes=new ArrayList();
mshtml.IHTMLDOMNode nod;
children=(mshtml.IHTMLDOMChildrenCollection)doc.childNodes;
foreach(mshtml.IHTMLDOMNode node in children) nodes.Add(node);
mshtml.IHTMLAttributeCollection attributes;
for(int a=0;a
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How can I write a prog to Pop up a message box notifying me about an meeting ,refering to the calander of the outlook, half an hour before meeting.
Also I want the system to take data from Data Base connected to the Outlook and send me an SMS 30 mins before meeting..............
Can you help me out please.......
Thanx And Regards
Arjo
Arjo Gupta
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Use the Outlook interop dlls to interop with Outlook and retieve Outlook data. See the MSDN article here[^] for further information.
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I have did a program such that , i will have two text box name and age in my form..and a button..so that when the values entered r in the text box..a xml file is created with those data...
and my coding is as follows.
Inside the burtton click, th e coding is as follows
//create a dataset
DataSet dataSet = new DataSet();
//read the schema
dataSet.ReadXmlSchema("d:\\Menu.xsd");
//create a new row
DataRow newrow;
newrow = dataSet.Tables[0].NewRow();
//enter the values
newrow[0] = Convert.ToInt32(txtName.Text);
newrow[1] = Convert.ToInt32(txtAge.Text);
//add the row to the dataset
dataSet.Tables[0].Rows.Add(newrow);
//write the data to a xml file
dataSet.WriteXml("D:\\myData.xml", XmlWriteMode.WriteSchema);
MessageBox.Show("saved");
Now i have one doubt..
ie, the program which i did ..now ..in the form...when i am giving data as
for
name: john
age:22...
now myData.xml wil be saved with those data ... Now if i am clearing those vaues in th textbox and adding some other data... that should be added without deleting the previous data... and also if i am entering again john..it should show that already it exists....
please say how to do this...
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Before writing to the XML file, read the existing one into a DataSet. Before writing a new name & age to the XML file, first make sure its not in the dataset. If it is, show a box saying it already exists.
That said, if you're going to be storing lots & lots of data like this, I recommend you use a database rather than XML files. XML files are good for configuration, settings, storing discreet, concise bits of information in a human readable format. If that's not what your goals are, you should choose another tool such as a database to store your data.
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Hi
I have did a program such that , i will have two text box name and age in my form..and a button named save. so that when the values entered r in the text box..a xml file is created with those data...
Now I can able to create one set of values…. No what I need is that when again some other value is entered in the textbox. It should also be written in the xml file..but without deleting the other. I mean it should append on the other..
For example: first I entered forst as john and 22 for name and age ..it will added in the xml file..no again if I enter charu and 23 as name and age..
Now xml should have john and 22 as well as charu and 23…
And also one more thing is that if I again enter John. It should give a message that it has already been entered. No values should be repeated again. Please help me to do this…..
The coding which I did is as follows.
In side the button click
//save Button
private void button1_Click(object sender, System.EventArgs e)
{
DataSet dataSet = new DataSet();
//read the schema
dataSet.ReadXmlSchema("..\\..\\PlaygroMenu.xsd");
//create a new row
DataRow oValues;
oValues = dataSet.Tables[0].NewRow();
//enter the values
oValues[0] = txtName.Text;
oValues[1] = Convert.ToInt32(txtAage.Text);
//check for duplication
bool hasalready = false;
foreach(DataRow row in dataSet.Tables[0].Rows)
{
if(row.ItemArray[0].ToString().Equals(txtID.Text))
{
hasalready = true;
}
}
//
if(!hasalready)
{
//add the row to the dataset
dataSet.Tables[0].Rows.Add(oValues);
//write the data to a xml file
dataSet.WriteXml("..\\..\\resultdata.xml", XmlWriteMode.WriteSchema);
MessageBox.Show("Saved");
}
else
{
MessageBox.Show("Already Exists");
}
}
private void Form1_Load(object sender, System.EventArgs e)
{
DataSet dataSet = new DataSet();
//read the schema
dataSet.ReadXmlSchema("..\\..\\Menu.xsd");
System.IO.FileInfo file = new System.IO.FileInfo("..\\..\\mydata.xml");
//check whethere there is result xml file...
if (file.Exists)
{
dataSet.ReadXml("..\\..\\resultdata.xml");
}
}
Please help me to do this..
Dhol
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Hi,
I am planning to use this approach please let me know if there is a problem in this approach..
Same code can be written for C# as well..
Thanks and Best Regards,
Shahid
// This example shows how to create an Object* containing task
// information, and pass that Object* to a task queued for
// execution by the thread pool.
#include "stdafx.h"
#using
using namespace System;
using namespace System::Threading;
// TaskInfo holds state information for a task that will be
// executed by a ThreadPool thread.
public __gc class TaskInfo
{
// State information for the task. These members
// can be implemented as read-only properties, read/write
// properties with validation, and so on, as required.
public:
String* Boilerplate;
int Value;
Thread *tHandle;
// Public constructor provides an easy way to supply all
// the information needed for the task.
TaskInfo(String* text, int number)
{
Boilerplate = text;
Value = number;
tHandle=NULL;
}
};
public __gc struct Example
{
// The thread procedure performs the independent task, in this case
// formatting and printing a very simple report.
//
static void ThreadProc(Object* stateInfo)
{
try
{
//Do Always
TaskInfo *tInfo= (TaskInfo *)(stateInfo);
tInfo->tHandle = Thread::CurrentThread;
TaskInfo* ti = dynamic_cast(stateInfo);
Thread::Sleep(10000);
Console::WriteLine(ti->Boilerplate, __box(ti->Value));
}
catch(ThreadAbortException *Te)
{
Console::WriteLine(S"Thread Aborted by Main Thread{0}",Te->ToString());
}
}
};
int main()
{
try
{// Create an object containing the information needed
// for the task.
TaskInfo* ti = new TaskInfo(S"This report displays the number {0}.", 42);
// Queue the task and data.
if (ThreadPool::QueueUserWorkItem(new WaitCallback(0, Example::ThreadProc), ti))
{
Console::WriteLine(S"Main thread does some work, then sleeps.");
// If you comment out the Sleep, the main thread exits before
// the ThreadPool task has a chance to run. ThreadPool uses
// background threads, which do not keep the application
// running. (This is a simple example of a race condition.)
Thread::Sleep(1000);
//Abort the Thread started
ti->tHandle->Abort();
Thread::Sleep(15000);
Console::WriteLine(S"Main thread exits.");
}
else
{
Console::WriteLine(S"Unable to queue ThreadPool request.");
}
}
catch (...)
{
Console::WriteLine(S"Unknown Exception Occured in Main");
}
return 0;
}
;
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I don't think aborting threadpool threads is a good idea. That apart, your code is susceptible to a race condition between assigning and using tHandle.
tInfo->tHandle = Thread::CurrentThread;
is not guaranteed to run before
ti->tHandle->Abort();
so you'll get a NullReferenceException if that happens.
Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro
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How can I implement password remembrance feature in Windows Forms Login Dialog box in a windows based application?
If anyone have code snippet to implement such kind of feature, that would be a great help..........
Thanks,
Sandeep
+919891027854
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Write your saved settings to disk. Better yet, in Visual Studio 2005, add a .settings file to your project, which will take care of reading & writing it to disk for you.
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It is not clear what u r specifying. I am building windows forms application with C# in Visual Studio.NET
I want to save password for the user. How can i do it? If u have a code snippet, Plz send that...
Thanks,
Sandeep
+919891027854
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Look up application settings files in .NET 2.0. For example, here's[^] something I found simply by searching Google.
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Hi, i have a problem about datagridview.
When i apply a sorting operation on a datagridview, it sortes the items well, but changes the selected item (not selected index). Let me explain this:
For example, my sort column's values below:
aaa (selected)
bbb
ccc
ddd
after sorting:
ddd (selected)
ccc
bbb
aaa
It changes the selected item. But i want my first selected item will stay in selected.
Does anyone know how can i do this?
Thanks.
ozgur.nevres
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Get the item selected before sorting. After sorting, re-select that item. Would that work for you?
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