programmatically code generation in C# using codedom

Question

I want to generate code for creating a hash table object and assigning it with a key and a value programmatic . it should be similar to

Hashtable ht = new Hashtable();

ht.Add( "key1", "value1" );
ht.Add( "key2", "value2" );
ht.Add( "key3", "value3" );

for eg

CodeMemberMethod testMethod = new CodeMemberMethod();

        testMethod.Name = "Test" + mi.Name + "_" + intTestCaseCnt;
        testMethod.Attributes = MemberAttributes.Public;.....

here it creates a method programmatically now I want to create a hashtable so I am asking how?

I might be a bit slow but I have no idea what you asking. Can you please rephrase or give some context. — uriDium, Apr 09 '09 at 09:51
Can you be more specific please ? Like, what are your inputs (database, file) ? Is this a one shot operation to generate a piece of code ? — Cédric Rup, Apr 09 '09 at 09:52
@uriDium, I hope you're not slow, but if you are, you're not alone... — ybo, Apr 09 '09 at 09:53
using code dom i want to write a code programactic such that my code writes a code and dispaly it in text file — Arunachalam, Apr 09 '09 at 09:59
Better question is : are you just trying to generate a piece of code or are you building a code generator ? Using codedom to generate a single piece of code is an overkill ! — Cédric Rup, Apr 09 '09 at 10:08
I HAVE ACHIEVE THIS FOR ALL BASIC DATATYPES LIKE INT FLOAT NOW I NEED IT TO INPLEMENT FOR A HASH TABLE I JUST NEED TO KNOW HOW WILL U DECLARE A HASH TABLE PROGRAMATICALY — Arunachalam, Apr 09 '09 at 10:12
What problem do you have when you try to do the same thing for Hashtable? You don't get good answers here when you ask people to do your job for you. — John Saunders, Apr 09 '09 at 10:35
And there's no need to shout, you're being rude. Not the way to have answers when you ask a question ! — Cédric Rup, Apr 09 '09 at 11:35
Don't understand why people are marking this down, it's a fair question. — Quibblesome, Apr 09 '09 at 14:44

Andy McCluggage · Answer 1 · 2009-04-09T10:13:39.987

5

For code generation consider the Text Template Transformation Toolkit (T4)

This template...

Hashtable ht = new Hashtable();
<#
    foreach (var obj in DataSource)
    {
#>
ht.Add( "<#= obj.Key #>", "<#= obj.Value #>" );
<#
    }
#>

...would generate this output...

Hashtable ht = new Hashtable();
ht.Add( "key1", "value1" );
ht.Add( "key2", "value2" );
ht.Add( "key3", "value3" );
...
ht.Add( "keyN", "valueN" );

Where N is the number of records in your DataSource.

The best thing is, this is built right into Visual Studio 2008

I have had good experiences with it

edited Apr 09 '09 at 10:13

answered Apr 09 '09 at 09:55

Andy McCluggage

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Sorry if I misunderstood from you initial clear-as-mud question. The Edit isn’t much better either. I give up. – Andy McCluggage Apr 09 '09 at 10:09
Apologies, I missed the crucial part of the edit – “using codedom”. Shame this wasn’t there from the start and I could have saved some time. – Andy McCluggage Apr 09 '09 at 10:15
even with code dom this is a nice solution. Text transform is a pretty sweet tool. – Quibblesome Apr 09 '09 at 14:34

score 1 · Answer 2 · answered Apr 09 '09 at 10:52

Where are you stuck? You know how to create a CodeMemberMethod, so you should be able to add statement objects to the CodeMemberMethod.Statements collection. You'll need one statement for the variable declaration, one for the assignment/initialization and one for each "Add"-Call.

BTW: I've used Code DOM in the past, but found that generating code directly with a templating engine is less works and makes the code far more readable. I usually use StringTemplate, and I'm very happy with it.

score 1 · Accepted Answer · answered Apr 09 '09 at 12:42

CodeParameterDeclarationExpression hashTableParam =new CodeParameterDeclarationExpression();
hashTableParam.Name = "hastable";

hashTableParam.Type = new CodeTypeReference(typeof(System.Collections.Hashtable));

this what i was looking for thanks for ur efforts

score 0 · Answer 4 · answered Apr 09 '09 at 09:58

0

The two code generators I'm aware of are ...

Codesmith at ... main site, with a free version

T4 which is in Scott Hanselman has a blog post about it here

answered Apr 09 '09 at 09:58

SteveC

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programmatically code generation in C# using codedom

4 Answers4