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Hi,
How can i call a function from another when i only have the name of the function in a string parameter. I want to call the second function with the designated parameters and get the return value.
<br />
public double F2(string param1, int param2)<br />
{<br />
<br />
}<br />
<br />
public void F1(string FunctionName)<br />
{<br />
}<br />
Please help 
Do your best to be the best
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double res;
res = F2("",0);
or
F2("",0);
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You need to use Reflection here.
The following code is not complete but I think it will help you.
using System.Reflection;
.....
public void CallMethod(string methodName)
{
MethodInfo methodInfo = this.GetType().GetMethod(methodName);
if (methodInfo == null)
{
throw new MissingMethodException(this.GetType().Name,methodName);
}
methodInfo.Invoke(this, new object[] { "Param1", 50 });
}
public void MethodToBeCalled(string param1, int v)
{
Console.WriteLine(param1);
Console.WriteLine(v);
}
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Why, oh why, would you identify the method using a string?
Perhaps you should explain what it is that you are trying to accomplish, instead of asking how it's done the way that you think that it should be done.
---
b { font-weight: normal; }
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how can i add connection string in the web.config and how can i change the server name from this file by code?
fatma
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web.config file
<connectionstrings>
<add name="Conn" connectionstring="..." providername="System.Data.SqlClient">
Code (to get the connection string):
System.Configuration.ConfigurationManager.ConnectionStrings["Conn"].ConnectionString;
As for changing the server you can try replacing in the string the existent IP address with another one
Do your best to be the best
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<configuration>
<connectionStrings>
<add name="connectionStringName"
connectionString="Data Source=localhost; Initial Catalog=databaseName; uid=username; pwd=password;"/>
</connectionStrings>
</configuration>
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hello everybody!!
iam generating a windows form which has a treeview at the left and a splitpanel at its right.
the treeview consists of 3 parent nodes with 1 child node in each parent node. the parent nodes have a contextmenu with "Start" and "Stop" as menu items and child nodes have a contextmenu with "Properties" as menuitem.
each of the menuitem has an OnClick event handler.
what i want is, on clicking the menuitem of each of the child nodes, a different panel should be displayed each time. for this, i need to have 3 panels, one for each childnode. when one panel is being displayed, others should be hidden. my requirement is something similar to the WindowsExplorer, but iam not able to generate the desired o/p.
Also, when i right-click on any of the node, the contextmenu is displayed, but after clicking the desired menuitem, the contextmenu just doesnt disappear.
am i missing some property tat has to be set for the contextmenu to disappear after selecting a menuitem?
this is a part of my code:
mnuParentMenu.MenuItems.Add(0, new MenuItem("Start", new System.EventHandler(mnuStart_Click)));<br />
mnuParentMenu.MenuItems.Add(1, new MenuItem("Stop", new System.EventHandler(mnuStop_Click)));<br />
mnuChildMenu.MenuItems.Add(0, = new MenuItem("Properties", new System.EventHandler(mnuPropertiesC_Click)));<br />
<br />
TreeNode node = new TreeNode("Parent");<br />
node.Tag = "ParentNodeMenu";<br />
node.ContextMenu = mnuParentMenu;<br />
treeView1.Nodes.Add(node);<br />
node = new TreeNode("Child");<br />
node.Tag = "ChildNodeMenu";<br />
node.ContextMenu = mnuChildMenu;<br />
treeView1.Nodes[0].Nodes.Add(node);
I would be thankful to all who wish to take some time and help me out.
Sonu
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Sonu.T wrote: what i want is, on clicking the menuitem of each of the child nodes, a different panel should be displayed each time. for this, i need to have 3 panels, one for each childnode. when one panel is being displayed, others should be hidden. my requirement is something similar to the WindowsExplorer, but iam not able to generate the desired o/p.
How have you implemented it currently and what happens if you click on a child node? Simply setting the Visible property of the panel to be hidden to false and sending it to the back of the ZOrder using SendToBack should work fine, I think. Another approach would be to have a single panel, but different UserControl derived classes. That way, designing the UI would be easier.
Sonu.T wrote: Also, when i right-click on any of the node, the contextmenu is displayed, but after clicking the desired menuitem, the contextmenu just doesnt disappear.
I'm surprised that you even get the context menu. This[^] KB article shows how to add multiple context menus for different nodes to treeviews. Basically, you subscribe to the MouseUp event, get the point where the mouse was clicked, use the GetNodeAt method to get the TreeNode at that point and then show the appropriate popup menu.
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thanx for replying.
i understand that there is no clarity in my query....
iam pasting my entire code here...hope this wud make better sense
public partial class Form1 : Form<br />
{<br />
private System.Windows.Forms.ContextMenu mnuParentMenu = new System.Windows.Forms.ContextMenu();<br />
private System.Windows.Forms.ContextMenu mnuChildMenu = new System.Windows.Forms.ContextMenu();<br />
private MenuItem mnuStart;<br />
private MenuItem mnuStop;<br />
private MenuItem mnuProperties;<br />
private MenuItem mnuPropertiesC;<br />
private TreeNode m_OldSelectNode;<br />
private TreeNode node;<br />
<br />
public Form1()<br />
{<br />
InitializeComponent();<br />
}<br />
<br />
private void Form1_Load(object sender, EventArgs e)<br />
{ <br />
mnuParentMenu.MenuItems.Add(0, mnuStart = new MenuItem("Start", new System.EventHandler(mnuStart_Click)));<br />
mnuParentMenu.MenuItems.Add(1, mnuStop = new MenuItem("Stop", new System.EventHandler(mnuStop_Click)));<br />
mnuParentMenu.MenuItems.Add(2, mnuProperties = new MenuItem("Properties", new System.EventHandler(mnuProperties_Click)));<br />
<br />
mnuChildMenu.MenuItems.Add(0, mnuPropertiesC = new MenuItem("Properties", new System.EventHandler(mnuPropertiesC_Click)));<br />
<br />
node = new TreeNode("Credit Files");<br />
node.Tag = "ParentNodeMenu";<br />
node.ContextMenu = mnuParentMenu;<br />
treeView1.Nodes.Add(node);<br />
node = new TreeNode("VIO Copy Process");<br />
node.Tag = "ChildNodeMenu";<br />
node.ContextMenu = mnuChildMenu;<br />
treeView1.Nodes[0].Nodes.Add(node);<br />
<br />
node = new TreeNode("Human Resources");<br />
node.Tag = "ParentNodeMenu";<br />
node.ContextMenu = mnuParentMenu;<br />
treeView1.Nodes.Add(node);<br />
<br />
node = new TreeNode("Secondary Batch Update Process");<br />
node.Tag = "ChildNodeMenu";<br />
node.ContextMenu = mnuChildMenu;<br />
treeView1.Nodes[1].Nodes.Add(node);<br />
<br />
node = new TreeNode("TimeDeposits");<br />
node.Tag = "ParentNodeMenu";<br />
node.ContextMenu = mnuParentMenu;<br />
treeView1.Nodes.Add(node);<br />
<br />
node = new TreeNode("PurgeProcess");<br />
node.Tag = "ChildNodeMenu";<br />
node.ContextMenu = mnuChildMenu;<br />
treeView1.Nodes[2].Nodes.Add(node);<br />
<br />
node = new TreeNode("SecondaryBatchUpdateProcess");<br />
node.Tag = "ChildNodeMenu";<br />
node.ContextMenu = mnuChildMenu;<br />
treeView1.Nodes[2].Nodes.Add(node);<br />
splitContainer1.Visible = false;<br />
mnuStop.Enabled = false;<br />
<br />
}<br />
protected void mnuStart_Click(object sender, System.EventArgs e)<br />
{<br />
mnuStart.Enabled = false;<br />
mnuStop.Enabled = true; <br />
}<br />
protected void mnuStop_Click(object sender, System.EventArgs e)<br />
{<br />
mnuStop.Enabled = false;<br />
mnuStart.Enabled = true;<br />
}<br />
protected void mnuProperties_Click(object sender, System.EventArgs e)<br />
{<br />
splitContainer1.Visible = true;<br />
splitContainer1.Panel1Collapsed = false;<br />
splitContainer1.Panel2Collapsed = true;<br />
<br />
}<br />
protected void mnuPropertiesC_Click(object sender, System.EventArgs e)<br />
{<br />
splitContainer1.Visible = true;<br />
splitContainer1.Panel1Collapsed = true;<br />
splitContainer1.Panel2Collapsed = false;<br />
}<br />
private void treeView1_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)<br />
{<br />
if (e.Button == MouseButtons.Right)<br />
{<br />
<br />
Point p = new Point(e.X, e.Y);<br />
<br />
TreeNode node = treeView1.GetNodeAt(p);<br />
if (node != null)<br />
{<br />
m_OldSelectNode = treeView1.SelectedNode;<br />
treeView1.SelectedNode = node;<br />
<br />
switch (Convert.ToString(node.Tag))<br />
{<br />
case "ParentNodeMenu":<br />
mnuParentMenu.Show(treeView1, p);<br />
break;<br />
case "ChildNodeMenu":<br />
mnuChildMenu.Show(treeView1, p);<br />
break;<br />
}<br />
<br />
treeView1.SelectedNode = m_OldSelectNode;<br />
m_OldSelectNode = null;<br />
if (node.Text.Equals("Credit Files"))<br />
{<br />
label1.Text = "Weekly Processes";<br />
}<br />
else if (node.Text.Equals("Human Resources"))<br />
{<br />
label1.Text = "Daily Process";<br />
}<br />
}<br />
}<br />
}<br />
<br />
}
each child node has a different set of properties which have to be set...i presume that for each child node we need a different panel.
also u have mentioned about some UserControls in one panel....i did not get that. Can u plz throw some more light on it?
waiting for your reply...
Sonu
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Sonu.T wrote: about some UserControls in one panel
You could have separate UserControls instead of separate panels (Right click on Project in Solution Explorer -> Select Add -> UserControl). That way, each of your "panels" will be separate entities at design time. If you put everything in panels directly, then the main form holding all the panels would be congested with controls from different panels (when designing the UI from Visual Studio).
So you could have one panel to the right of the splitter and UserControl derived class for each of your screens. You could then load the appropriate control depending on the node selected in the tree. Something like
TreeNode selectedNode = ...;
switch(selectedNode.Text)
{
case "Weekly Processes";
panel.Controls.Clear();
panel.Controls.Add(weeklyProcessesControl);
break;
...
}
where panel is the System.Windows.Forms.Panel to the right of the splitter and weeklyProcessesControl is the usercontrol.
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can I declare a variable, set it to a name of a form
then show it.
string a = "frm1";
form f = new a
f.show
help me
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i don't know the exact solution but i use
if( a == "frm1")
{
form f = new a
f.show
}
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Why do you want to do something like this? If all you want is to set the name of form, you could as well do
Form f = new YourForm();
f.Name = "frm1";
f.Show();
If frm1 is the name of the System.Windows.Forms.Form derived type and you want to instantiate it dynamically, you can do something like
string formTypeName = "frm1";
Type formType = Type.GetType(formTypeName);
Form f = (Form)Activator.CreateInstance(formType);
f.Show();
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I have 2 List: customer list, supplier list
I have designed frmCus for customer list
I have designed frmSup for suppler list
I have a textbox: txta
I have a button : but1
When I click but1, if txta = "frmCus" then frmCus.show
else if txta = "frmSup" then frmSup.show
Can you help me ?
Thanks
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When handling the button click, do you already have instances of frmCus and frmSup? If you do, you can simply do
Form form = null;
if (txta.Text == "frmCus")
form = frmCus;
else if (txta.Text = "frmSup")
form = frmSup;
form.Show();
If not, you'd have to resort to using reflection to create instances of frmCus and frmSup, using Activator.CreateInstance.
Form form = null;
if (txta.Text == "frmCus" || txta.Text = "frmSup")
form = (Form)Activator.CreateInstance(null, txta.Text);
form.Show();
This would create instances of frmCus and frmSup everytime you click the button, which may or may not be what you want. If you want to avoid creating instances everytime, you can have member variables in the class to refer to the instances created and then check for null before creating the instance.
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Hi
I have problem with this code.
when a soloution have a more than project its not work
this code works only for main project. and for another project the value of formType is null.
please help me.
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i create a class and generated random numbers using
texture = TextureStorageComposer.Objects[random.Next(0, 4)];
and then create 10 instances of that class
now the wired thing is that it gives same value to each instance when i run it
it gives different values when i step through it
i think this is because random is a time based function and all this processing is happening in less than 1ms (so all instances have same time for computer)
can you please help me in workaround 
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Are you creating 10 instances of System.Random or are you reusing the same instance and calling Next? You should be getting repeated numbers only if you create multiple instances of the class very quickly. Did you try creating a single instance and repeatedly calling Next instead?
Alternatively, you could try using the RandomNumberGenerator[^] class.
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Hi,
Im just wondering, how do you write the equals operator in C#.
Im slightly confused about the syntax.
For example in C++ for a vector :
<br />
class vector{<br />
private:<br />
float m_x;<br />
float m_y;<br />
float m_z;<br />
<br />
public:<br />
vector(x,y,z): m_x(x),m_y(y),m_z(z);<br />
vector(): m_x(0),m_y(0),m_z(0);<br />
~vector();<br />
<br />
bool operator==(Vector v)<br />
{<br />
if (this == v)<br />
return true;<br />
else<br />
return (m_x == v.m_x && v.m_y && v.m_z);<br />
}<br />
}<br />
I know its got something to do the Equals Function and Reference Equals Method. How do you test to see if its the same instance?
Many Thanks in advance 
Tom
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Thanks Nick,
Much Appreciated.
Its just that in C++ you would use the this statement and check against the type on the right.
I was just wondering if ReferenceEquals and Equals use the same kind of technique deep down in the CLR thats all.
But as for implementing it, you've hit the nail on the head.
Many Thanks 
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hi
it is my Code :
DataTable dt = new DataTable();foreach (DataGridViewRow _gridViewRow in dataGridView1.Rows)
{
if (_gridViewRow.Cells[0].Value != null && _gridViewRow.Cells[0].Value.ToString() == "True")
dt.ImportRow(ds_zamin1.Khaneh_1.Rows[_gridViewRow.Index]);
}
this.dataGridView1.DataSource = dt; // dt is global viriable
but when i execute this method,nothing occured,only myDatagridView show some blank row(s).
how to solve problem ?
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Is there any way, when implementing a lock, that an incoming thread can force its own priority over the ones currently queued?
i.e. i've got 10 threads waiting to add items to a stack, and a thread that copies, empties and leaves the lock to process the copied items.
I don't want to wait N milliseconds for the items to be added to the stack as the processing thread is a priority, so i want the processing thread to jump to the front of the lock queue.
Is this possible? And how could i do it?
Cheers guys
Tristan Rhodes
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