Compiler Error Message: Cannot implicitly convert type 'long' to 'string'

Question

I have an issue in conversion. What is wrong with this conversion?

Here is the error:

Compilation Error Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.

Compiler Error Message: CS0029: Cannot implicitly convert type 'long' to 'string'

if (hid_Action.Value.ToString().ToUpper() == "RENEW")
{
    string strHFUpdate = string.Empty;
    string srt = Convert.ToInt64(Session["AppId"] + ",'" + Session["CAAID"].ToString() + "','" + Session["UserType"].ToString() + "'");
    strHFUpdate = "oea_sp_update_HF_MC_Renewal_Status " + srt;
    rProxy.GlobalSaveData(Session["CountyName"].ToString().Trim(), strHFUpdate.ToString());
}

this might help you :-social.msdn.microsoft.com/forums/en-US/csharpgeneral/thread/… — Mandar Pande
– Mandar Pande, Commented Jun 13, 2011 at 18:15

BrunoLM · Accepted Answer · 2011-06-13 18:18:12Z

3

Here is the problem

string srt = Convert.ToInt64

You are trying to assign a long value to a string. You can't. You have to use .ToString() to change it into a string, then you will be able to assign.

And one more error, Convert.ToInt64 doesn't convert number with float points, meaning 1.1 will throw an exception. An the string you are trying to convert is totally invalid, what was it supposed to do?

answered Jun 13, 2011 at 18:18

BrunoLM

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3 Comments

userstackoverflow Over a year ago

This is what my predecessor wrote:

userstackoverflow Over a year ago

if (hid_Action.Value.ToString().ToUpper() == "RENEW") { string strHFUpdate = string.Empty; strHFUpdate = "oea_sp_update_HF_MC_Renewal_Status " + Convert.ToInt64(Session["AppId"].ToString() + ",'" + Session["CAAID"].ToString() + "','" + Session["UserType"].ToString() + "'"); rProxy.GlobalSaveData(Session["CountyName"].ToString().Trim(), strHFUpdate.ToString()); }

userstackoverflow Over a year ago

And i am getting this error: Input string was not in a correct format. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.FormatException: Input string was not in a correct format.

Hans Passant · Accepted Answer · 2011-06-13 18:14:45Z

2

 string srt = Convert.ToInt64(...);

Yes, that cannot work. Hard to guess what was intended here, maybe a missing parenthesis.

answered Jun 13, 2011 at 18:14

Hans Passant

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1 Comment

TylerH Over a year ago

So what is the solution? How does one convert a long to a string?

Mr.Wizard · Accepted Answer · 2011-06-14 06:24:16Z

You can't convert a string with commas and single-quotes into a number, additionally, both ToInt64() overloads take a second parameter:

Your code above is trying to implicitly cast the string into another data-type that ToInt64() can take for an overload with a single parameter. ToInt64() does support converting from string but both those overloads take two parameters (see below)

[ From MSDN: http://msdn.microsoft.com/en-us/library/system.convert.toint64.aspx ]

ToInt64(String, IFormatProvider) Converts the specified string representation of a number to an equivalent 64-bit signed integer, using the specified culture-specific formatting information.

ToInt64(String, Int32) Converts the string representation of a number in a specified base to an equivalent 64-bit signed integer.

But as I mentioned, even if you did use the correct overloaded function, your string would not be parse-able due to the non-numeric characters.

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