在 StreamWriter 中对数字求和，而不是在 C# 中彼此相邻写入

Question

I would like to write every data to a CSV file. Everything is working fine, but the numbers aren't adding up, they are written next to each other.

This part of the code:

file.WriteLine("\"1. koordinata:\"" + ";" + opening.rect_co_x + ";" + cord.y + ";" + opening.rect_co_z);
file.WriteLine("\"2. koordinata:\"" + ";" + opening.rect_co_x + opening.rect_width + ";" + cord.y + ";" + opening.rect_co_z);

Every property is a double, uint or int .

What I expect: 1 + 3 = 4

What I got: 1 + 3 = 13

Answer 1

+ : mean a string concatenation, you can't calculate some of int inside string directly.
Try to use the following approach:

int a = 1, b = 3;
string str = $"a;{a + b};b"; // a;4;b

//or string.Format
string str2 = string.Format("a;{0};b", a + b);

You can change your code to:

file.WriteLine($"\"1. koordinata:\";{opening.rect_co_x };{cord.y};{opening.rect_co_z}");
file.WriteLine($"\"2. koordinata:\";{opening.rect_co_x + opening.rect_width};{cord.y};{opening.rect_co_z}");

I hope this help.