类型转换错误

Question

int age = txtAge.Text; 

，我发现了错误：

Error 2 Cannot implicitly convert type 'string' to 'int' 

Answer 1

int age = int.Parse(txtAge.Text); 

Answer 2

尝试

int age; 
bool result = Int32.TryParse(txtAge.Text, out age); 

if (result) 
{ 
    // Parse succeeded and get the result in age 
} 
else 
{ 
    // Parse failed 
} 

见Int32.TryParse Method (String, Int32)

The TryParse method is like the Parse method, except the TryParse method does not throw an exception if the conversion fails. It eliminates the need to use exception handling to test for a FormatException in the event that s is invalid and cannot be successfully parsed.

Answer 3

当然可以” t，int和string是两种完全不同的类型。然而，最简单的解决办法是：

int age = Int32.Parse(txtAge.Text); 

更安全的是：

int age; 
Int32.TryParse(txtAge.Text, out age);