Architecture :: What Is Component Based Development In Dotnet
Feb 19, 2010
1. Can you explain me what is component based development ? What I am already doing is using layers (user interface, custom types, data access layer and busines logic layer). For example for filling a drop down list with countries what I do is getting data from DAL using custom types in my BLL and BLL return a list of countries to user interface. Now in my opinion it is a plug-able component that I can use anywhere. Should it be called a component ?
2. What is a component a method ? or class or a assambly ?
3. Can components be like that (methods and assemblies) or they are services to embed ?
4. Actually I never have used services, if component can be in both ways (services & classes and assemblies) than what approach is better, should component be made in form of assemblies or services ?
5. Without being so technical any general rules on making re-usable components ?
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[Code]....
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Probably one of those things you know and use every day without thinking what it is:
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From the naming I think I'm using both (of course, I must be wrong if things are asked like this).
My web front-end (Pages and Code behind / Views and Controllers) are Request/Action while my other layers are Component based...no?
Or does this apply to specific frameworks or ways doing things?
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Edit: I would like to keep the infrastructure as is, so while the framework ideas are appreciated, please keep your suggestions centered on the context I have provided.
Background
I'm building a web-based application that dynamically loads plugins. Each plugin comes with a manifest file that contains its dll location, namespace, and type.
Right now I'm using System.Reflection.Assembly.LoadFile to load up the dlls based off the locations provided in the manifest files. Then I load the types and so on.
As an Aside:
I may wind up changing to System.Reflection.Assembly.LoadFrom since I'll eventually be loading files from outside the bin directory. But if their is a better way (Assembly.Load or something), feel free to add that in as well
Problem
The problem is that Multiple plugins can potentially run off the same dll. So I wind up executing System.Reflection.Assembly.LoadFile("Identical.dll") multiple times.
I have the idea to check if my assembly has already been loaded by iterating through AppDomain.CurrentDomain.GetAssemblies(), but I don't know if that will help with performance (or if it will work period, I haven't tried it).
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Feb 10, 2011
i got a problem.. how i can declare template textbox in a datagrid at code behind? i already make a stored procedure and put the update query inside it.. if i declare the textbox inside code behind(.aspx.vb).. there will be an error.. " there is already a component named "txtitem1"component must have a unique name.."
Dim con As New SqlConnection(ConfigurationSettings.AppSettings("ConnectionString1"))
Dim cmd As New SqlCommand
Dim sda As New SqlDataAdapter
cmd.CommandType = CommandType.StoredProcedure
cmd.CommandText = "ETendering3"
cmd.Parameters.Add("@item", SqlDbType.NVarChar).Value = txtitem1.Text
cmd.Parameters.Add("@price", SqlDbType.Decimal).Value = txtprice1.Text
cmd.Parameters.Add("@remark", SqlDbType.NVarChar).Value = txtremark1.Text
cmd.Parameters.Add("@consump", SqlDbType.Decimal).Value = txtconsump1.Text
cmd.Parameters.Add("@value", SqlDbType.Decimal).Value = txtvalue1.Text
cmd.Connection = con
Try
con.Open()
DataGrid12.DataSource = cmd.ExecuteReader()
DataGrid12.DataBind()
Finally
con.Close()
End Try
con.Dispose()
cmd.Dispose()
con = Nothing
cmd = Nothing
_______________________________________________________
.aspx
<Columns>
<asp:BoundColumn DataField="Listing_Id" HeaderText="Listing"></asp:BoundColumn>
<asp:BoundColumn DataField="No" HeaderText="No"></asp:BoundColumn>
<asp:BoundColumn DataField="Item_Category" HeaderText="Category"></asp:BoundColumn>
<asp:TemplateColumn HeaderText="Description">
<ItemTemplate>
<asp:TextBox id=TextBox1 runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.Item_Description") %>'>
</asp:TextBox>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox id="txtitem1" runat="server"></asp:TextBox>
</EditItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="Price" FooterText=" 10/50">
<ItemTemplate>
<asp:TextBox id=TextBox3 runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.Price") %>'>
</asp:TextBox>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox id="txtprice1" runat="server"></asp:TextBox>
</EditItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="Remarks">
<ItemTemplate>
<asp:TextBox id=TextBox2 runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.Remark") %>'>
</asp:TextBox>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox id="txtremark1" runat="server"></asp:TextBox>
</EditItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="Consumption">
<ItemTemplate>
<asp:TextBox runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.Consumption") %>'>
</asp:TextBox>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" ID="txtconsump1"></asp:TextBox>
</EditItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="Value">
<ItemTemplate>
<asp:TextBox runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.Value") %>'>
</asp:TextBox>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" ID="txtvalue1"></asp:TextBox>
</EditItemTemplate>
</asp:TemplateColumn>
</Columns>
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Question 1:
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Question 2:
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