string
what is the diff between string,and convert.string
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Satyapriya NayakPosted Nov 7, 2012, 7:10 AM
Convert.ToString handles null and not throws ObjectReferenceNullException. ToString does not handles the null value and throws the null exception error message.
C#
public String FullName = null;
protected void Page_Load(object sender, EventArgs e)
{
try
{
Response.Write(".ToString
");
Response.Write("FullName :" + FullName.ToString());
}
catch (Exception ex)
{
Response.Write(ex.Message);
}
Response.Write("
");
try
{
Response.Write("Convert.ToString
");
Response.Write("FullName :" + Convert.ToString(FullName));
}
catch (Exception ex)
{
Response.Write(ex.Message);
}
}
Vithal WadjePosted Nov 7, 2012, 6:56 AM
Sandeep Singh ShekhawatPosted Nov 7, 2012, 6:52 AM
ToString() raise exception when the object is null
So in the case of object.ToString(), if object is null, it raise NullReferenceException.
Convert.ToString() return string.Empty in case of null object
(string) cast assign the object in case of null
So in case of
MyObject o = (string)NullObject;
But when you use o to access any property, it will raise NullReferenceException.