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Convert.ToDouble Method (Object)
May 02, 2013
Converts the value of the specified Object to a double-precision floating point number.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- value
- Type: System.Object
An Object that implements the IConvertible interface or null.
Return Value
Type: System.DoubleA double-precision floating point number equivalent to the value of value, or zero if value is null.
| Exception | Condition |
|---|---|
| InvalidCastException | value does not implement IConvertible. |
If value is not null, this method wraps a call to the IConvertible.ToDouble implementation of the underlying type of value.
The following code sample illustrates the conversion of a String to Double using ToDouble.
public void ConvertDoubleString(double doubleVal) { string stringVal; // A conversion from Double to string cannot overflow. stringVal = System.Convert.ToString(doubleVal); outputBlock.Text += String.Format("{0} as a string is: {1}", doubleVal, stringVal) + "\n"; try { doubleVal = System.Convert.ToDouble(stringVal); outputBlock.Text += String.Format("{0} as a double is: {1}", stringVal, doubleVal) + "\n"; } catch (System.OverflowException) { outputBlock.Text += String.Format( "Conversion from string-to-double overflowed.") + "\n"; } catch (System.FormatException) { outputBlock.Text += String.Format( "The string was not formatted as a double.") + "\n"; } catch (System.ArgumentException) { outputBlock.Text += String.Format( "The string pointed to null.") + "\n"; } }
