specified cast is not valid?

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hi am getting this error as specified cast is not valid.can any one suggest me how to solve this..

C#

else if ((objDFPropTemp.dfFieldType == "money") || (objDFPropTemp.dfFieldType == "decimal"))
                  {
                      if (objDFPropTemp.dfFieldValue != null)
                      {
                          txt.Text = ((decimal)objDFPropTemp.dfFieldValue).ToString();//this line am getting error.
                      }
                  }
                  else
                      txt.Text = (string)objDFPropTemp.dfFieldValue;
              }

thanks

Posted 5-Jun-12 19:58pm

ythisbug

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Comments

Zoltán Zörgő 6-Jun-12 2:06am

I have the same (unanswered) question as with you other post: What is the type of objDFPropTemp object and it's dfFieldValue property?

ythisbug 6-Jun-12 2:27am

DynaControlsPL objDFPropTemp = (DynaControlsPL)gListDynamicControls[i];

and dfFiedlValue is column name from dynamicform..am using dynamic in my class

3 solutions

Solution 1

Don't cast :

C#

txt.Text = objDFPropTemp.dfFieldValue.ToString();

Posted 5-Jun-12 20:06pm

Mehdi Gholam

Comments

VJ Reddy 6-Jun-12 2:12am

Good answer. 5! for speed.

Mehdi Gholam 6-Jun-12 2:34am

Thanks VJ!

ythisbug 6-Jun-12 2:14am

thanks
but if i do as u say i will get error for other line

if ((objDFPropTemp.dfFieldValue != null) && ((int)objDFPropTemp.dfFieldValue > 0))
for this line also same error i will get

VJ Reddy 6-Jun-12 2:28am

Convert dfFieldValue to int. Please see update to my answer.

Maciej Los 6-Jun-12 18:06pm

Good answer, my 5!

Solution 2

It looks like, object property objDFPropTemp.dfFieldValue is not a valid decimal datatype value - hence the error.

What you are trying to do is unbox. It will be valid only if the dfFieldValue underlying datatype is decimal. If the value of the field objDFPropTemp.dfFieldValue is a valid decimal then you can use a Convert.ToDecimal method.

As of now, since you want a string equivalent of it to be assigned to a text, just do:

C#

txt.Text = objDFPropTemp.dfFieldValue.ToString();

Posted 5-Jun-12 20:10pm

Sandeep Mewara

Comments

VJ Reddy 6-Jun-12 2:13am

Good answer and 5! for speed.

Maciej Los 6-Jun-12 18:07pm

Good answer, my 5!

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VJ Reddy · Accepted Answer · 2012-06-05T20:11:00

Solution 3

As seen from the question the objDFPropTemp.dfFieldType is being tested for equality with "money" or "decimal" from which it can be inferred that objDFPropTemp.dfFieldType is of string type.

So the statement (decimal)objDFPropTemp.dfFieldValue will throw error as string cannot be cast to decimal.

Further this block of code will be executed only if (decimal)objDFPropTemp.dfFieldValue is either "money" or "decimal" in which case there is no point in converting this string to decimal.

So I think the following statement may be used

C#

if (objDFPropTemp.dfFieldValue != null)
    txt.Text = objDFPropTemp.dfFieldValue.ToString();

instead of

C#

else if ((objDFPropTemp.dfFieldType == "money") || (objDFPropTemp.dfFieldType == "decimal"))
      {
          if (objDFPropTemp.dfFieldValue != null)
          {
              txt.Text = ((decimal)objDFPropTemp.dfFieldValue).ToString();//this line am getting error.
          }
      }
      else
          txt.Text = (string)objDFPropTemp.dfFieldValue;
  }

[Update]in response to the comment from OP

If objDFPropTemp.dfFieldValue holds a numeric value in string format and it is required to check for its value then it can be converted to numeric value using Int32.TryParse as it will not throw error if the string value is null or not in the correct format, and then can be checked as shown below

C#

int val;
(Int32.TryParse(bjDFPropTemp.dfFieldValue, out val) && val > 0)

Posted 5-Jun-12 20:11pm

VJ Reddy

Updated 5-Jun-12 20:34pm

v2

Comments

Sandeep Mewara 6-Jun-12 2:14am

Yep! 5!

VJ Reddy 6-Jun-12 2:15am

Thank you, Sandeep :)

ythisbug 6-Jun-12 2:39am

as u said i tried like this

else if ((objDFPropTemp.dfFieldType == "money") || (objDFPropTemp.dfFieldType == "decimal"))
{
if (objDFPropTemp.dfFieldValue != null)
{
//txt.Text = ((decimal)objDFPropTemp.dfFieldValue).ToString();
txt.Text = objDFPropTemp.dfFieldValue.ToString();
}
}
else
txt.Text = (string)objDFPropTemp.dfFieldValue;
}

//but again in another line am getting error .error is same cast is not valid

if (objDFPropTemp.dfFieldType == "int")
{

// if ((objDFPropTemp.dfFieldValue != null) && ((int)objDFPropTemp.dfFieldValue > 0))
if((objDFPropTemp.dfFieldValue != null) && ((int)objDFPropTemp.dfFieldValue > 0))//this line am getting error now
{
if (objDFPropTemp.dfControlValue.Contains("["))
{
DataSet ds = new DataSet();
string varSubField = string.Empty;
string varField = string.Empty;

varSubField = objDFPropTemp.dfControlValue.Substring(objDFPropTemp.dfControlValue.IndexOf("[") + 1, objDFPropTemp.dfControlValue.IndexOf("]") - objDFPropTemp.dfControlValue.IndexOf("[") - 1);
varField = objDFPropTemp.dfControlValue.Substring(0, objDFPropTemp.dfControlValue.IndexOf("["));
string controlTable = objDFPropTemp.dfControlTable;
int id = (int)objDFPropTemp.dfFieldValue;
SISTextBoxPopupBLL sISTextBoxPopupBLL = new SISTextBoxPopupBLL();
ds = sISTextBoxPopupBLL.GetTextBoxDataByID(id, controlTable);

if (ds != null)
{
if (ds.Tables[0].Rows.Count == 1)
{
string fieldText = ds.Tables[0].Rows[0][varField].ToString();
int fieldValue = Convert.ToInt32(ds.Tables[0].Rows[0][varSubField]);
txt.Text = fieldText.ToString();//((int)(objDFPropTemp.dfFieldValue)).ToString();
txt.Attributes.Add("ID", fieldValue.ToString());
}
}
}
else
{
txt.Text = ((int)(objDFPropTemp.dfFieldValue)).ToString();

}

}
}
else if (objDFPropTemp.dfFieldType == "datetime")
{
if (objDFPropTemp.dfFieldValue != null)
{
txt.Text = ((DateTime)objDFPropTemp.dfFieldValue).ToShortDateString();
}
}
else if (objDFPropTemp.dfFieldType == "bit")
{
if (objDFPropTemp.dfFieldValue != null)
{

txt.Text = ((bool)(objDFPropTemp.dfFieldValue)).ToString();
}
}
else if ((objDFPropTemp.dfFieldType == "money") || (objDFPropTemp.dfFieldType == "decimal"))
{
if (objDFPropTemp.dfFieldValue != null)
{
//txt.Text = ((decimal)objDFPropTemp.dfFieldValue).ToString();
txt.Text = objDFPropTemp.dfFieldV

ythisbug 6-Jun-12 2:44am

int val;
(Int32.TryParse(bjDFPropTemp.dfFieldValue, out val) && val > 0)

where to declare this..thanks

Mehdi Gholam 6-Jun-12 2:34am

5'ed

VJ Reddy 6-Jun-12 2:36am

Thank you, Mehdi :)

Shahin Khorshidnia 6-Jun-12 2:37am

5

VJ Reddy 6-Jun-12 4:38am

Thank you, Shahin :)

taha bahraminezhad Jooneghani 6-Jun-12 5:08am

you type as you see!:)
all of you are kind of super solver!:)
5!

VJ Reddy 6-Jun-12 5:28am

Thank you very much, taha :)

Maciej Los 6-Jun-12 18:08pm

Very good, complete answer, my virtual 10!

VJ Reddy 6-Jun-12 19:40pm

Thank you very much, losmac :)