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Learn Windows 7: How to check the spelling of a message in Mozilla Thunderbird or Mozilla In this resource I will expalin how to check the spelling of a message in Mozilla Thunderbird or Mozilla
Resources » Articles » .NET Framework »
Difference among Int32.Parse(), Convert.ToInt32(), and Int32.TryParse()
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This article explains when to use Int32.Parse, Convert.ToInt32, and Int32.TryParse and which one is better.
Int32.parse(string)
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Int32.Parse (string s) method converts the string representation of a number to its 32-bit signed integer equivalent.
When s is null reference, it will throw ArgumentNullException.
If s is other than integer value, it will throw FormatException.
When s represents a number less than MinValue or greater than MaxValue, it will throw OverflowException.
Example:
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string s1 = "1234";
string s2 = "1234.65";
string s3 = null;
string s4 = "123456789123456789123456789123456789123456789";
int result;
bool success;
result = Int32.Parse(s1); //-- 1234
result = Int32.Parse(s2); //-- FormatException
result = Int32.Parse(s3); //-- ArgumentNullException
result = Int32.Parse(s4); //-- OverflowException
Convert.ToInt32(string)
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Convert.ToInt32(string s) method converts the specified the string representation of 32-bit signed integer equivalent. This calls in turn Int32.Parse () method.
When s is null reference, it will return 0 rather than throw ArgumentNullException
If s is other than integer value, it will throw FormatException.
When s represents a number less than MinValue or greater than MaxValue, it will throw OverflowException
Example:
result = Convert.ToInt32(s1); //-- 1234
result = Convert.ToInt32(s2); //-- FormatException
result = Convert.ToInt32(s3); //-- 0
result = Convert.ToInt32(s4); //-- OverflowException
Int32.TryParse(string, out int)
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Int32.Parse(string, out int) method converts the specified the string representation of 32-bit signed integer equivalent to out variable, and returns true if it parsed successfully, false otherwise. This method is available in C# 2.0
When s is null reference, it will return 0 rather than throw ArgumentNullException.
If s is other than integer value, the out variable will have 0 rather than FormatException.
When s represents a number less than MinValue or greater than MaxValue, the out variable will have 0 rather than OverflowException.
Example:-
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success = Int32.TryParse(s1, out result); //-- success => true; result => 1234
success = Int32.TryParse(s2, out result); //-- success => false; result => 0
success = Int32.TryParse(s3, out result); //-- success => false; result => 0
success = Int32.TryParse(s4, out result); //-- success => false; result => 0
Convert.ToInt32 is better than Int32.Parse, since it return 0 rather than exception. But, again according to the requirement this can be used. TryParse will be best since it handles exception itself always.
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