Remove column which has expression to other

Question

0.00/5 (No votes)

See more:

Quote:
I want to remove a column from datatable

the column is a part of expression I want to remove it once the expression is calculated.
 μ  LSL USL are columns already present

Lower.Expression = "(Convert(μ,'System.Double')-Convert(LSL,'System.Double'))/(3.0*sigma)";
Upper.Expression = "(Convert(USL,'System.Double')-Convert(μ,'System.Double'))/(3.0*sigma)";
CpK.Expression = "IIF(Lower < Upper, Lower, Upper)";



table1.Columns.Remove("Lower");//Exception
   
table1.Columns.Remove("Upper");//Exception
I want to remove lower and upper once the data is populated

Posted 20-Mar-14 0:14am

FarhanShariff

Updated 20-Mar-14 2:48am

v3

Add a Solution

Comments

BELGIUMsky 20-Mar-14 6:16am

I don't have experience with that problem but.
Can't you just hide the columns?

Why do you want to remove them?

VICK 20-Mar-14 8:27am


table1.Columns.Remove("Lower");
   
table1.Columns.Remove("Upper");

These seems to be fine. and should be working. Can you tell that what error or exception you are getting on that?

FarhanShariff 20-Mar-14 8:39am

first of all, you can't remove columns from a DataTable if they are involved in an Expression property. If you try to do so, you'll get an exception.

Secondly, you can't hide columns in a DataTable because the DataColumn class doesn't have a Visible property - hence the exception .

VICK 20-Mar-14 8:44am

Well, I was not aware of the first part. So Thanks for sharing this knowledge with me. Would be searching on GOOGLE for enhancement in that.
while for the Second, I am pretty sure and have it in knowledge, that's y didnt advise you that.

ANY WAY as you quoted that Columns can't be removed from a Datatable if they are involved in an Expression. Than Why are you trying that??/ :(

FarhanShariff 20-Mar-14 8:46am

I want to remove them once I have calculated and CpK column is populated

BELGIUMsky 20-Mar-14 9:32am

Have you tried some solutions found by google?
if i search for hidden columns datatable. i get a lot of answers

FarhanShariff 20-Mar-14 8:42am

Can you make a single expression for CpK which
CpK = Minimum|[ (μ - Lower) / 3 (sigma), (Upper -μ) / 3 (sigma)]|

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Anudeep Jaiswal - MCA · Answer 1 · 2014-03-20T00:19:00

Solution 1

Instead Of Remove, Why Not Visible = false

Posted 20-Mar-14 0:19am

Anudeep Jaiswal - MCA

Comments

FarhanShariff 20-Mar-14 6:22am

I tried to hide it
table1.Columns["Lower"].Visible = false;
It say you are missing directive or an assemble reference ?