使用binding-WPF设置数据网格列号(Setting data grid column numbers with binding-WPF)

 问题是您在计算浮点数时使用ints 。 在这里阅读： 为什么我不能从两个整数中分回一个双精度数 
 
 因此，要避免这种情况，您需要使用浮点数进行数学运算： 
 
pi = pi + (1.0 / (2.0 * i + 1.0));
 
 事实上，总是明确指定何时使用浮点数是个好主意，即使它是不必要的： 
 
const float pi_real = 3.14159;
const float one = 1.0;
 
 这使你的意图清晰，避免这样的错误。 这是一个实例。 

The problem is you are using ints when calculating a floating point number. Read about this here: Why can't I return a double from two ints being divided
 
So to avoid this you need to do the math with floating point numbers:
 
pi = pi + (1.0 / (2.0 * i + 1.0));
 
In fact it is a good idea to always explicitly specify when you intend to use floating point, even if it is unnecessary:
 
const float pi_real = 3.14159;
const float one = 1.0;
 
This makes your intention clear and avoids mistakes like this. Here is a live example.