string msg = string.Format("First photo result(X, Y, Angle): ({0:F4}, {1:F4}, {2:F4})",x, y, angle);
$的用法:是为了替代string.format()。
string str = $"字符1;{变量}";
int ID = 2;
str = $"the ID is : {ID}"; //str = "the ID is : 2";
int value = 55.89321;
float str = value.tostring("F3"); //str = "55.893"; F3表示格式为浮点数 ,保留3位小数
string to char 和 char to string
更改string的内容,
char[] d = DemoData[iRow].ToCharArray();
d[iRealCol + 6] = str[1].ToCharArray()[0];
DemoData[iRow] = new string(d);
判断string是否为空或者Null
string.IsNullOrEmpty(_password)