Question

C# AppendFormat()

StringBuilder sb=new StringBuilder();
Vector currentPoint=new Vector(0.0,0.0);
sb.Append("origin"); 是什么意思
foreach(Vector vector in this)
{
AppendFormat(" + {0}",vector); 是什么意思
currentPoint +=vector;
}

Answer 1

sb.Append("origin"); 是什么意思
在 sb的后面再加上 origin 这几个字母。（可以把sb就理解成一个字符串你就明白了）

AppendFormat(" + {0}",vector); 是什么意思
添加的字符串格式是 (" + {0}",vector 说的是： 一个 + 和一个参数 ，这个参数的值是遍历的vector的值

Answer 2

AppendFormat is available on StringBuilder. With it we append different kinds of data—including string literals—to an underlying string buffer. With it we create code that is clearer to read and modify. It handles formatting strings.StringBuilder Append
Example. This first example shows how to use a string literal to generate sentences in your StringBuilder. You can put parenthesis around values, which would be more confusing syntactically if you were to use string concatenation.
Tip:The core reason to use AppendFormat here is for clarity of the resulting code. It is clear to see what string data will be generated.
string.ConcatC# program that uses AppendFormat

using System;
using System.Text;

class Program
{
static void Main()
{
StringBuilder builder = new StringBuilder();
string[] data = { "Dot", "Net", "Perls" };
int counter = 0;
foreach (string value in data)
{
builder.AppendFormat("You have visited {0} ({1}).\n",
value,
++counter);
}
Console.WriteLine(builder);
}
}

Output

You have visited Dot (1).
You have visited Net (2).
You have visited Perls (3).

Example 2. Here we use the AppendFormat method on the StringBuilder type. Format strings in the C# language are a powerful of simplifying string changes for display. The AppendFormat method uses the same syntax.
Also:There are many advanced rules for string formatting, which are not covered in this document.
string.FormatProgram 2: C#

using System;
using System.Text;

class Program
{
static int[] _v = new int[]
{
1,
4,
6
};

static void Main()
{
StringBuilder b = new StringBuilder();
foreach (int v in _v)
{
b.AppendFormat("int: {0:0.0}{1}", v,
Environment.NewLine);
}
Console.WriteLine(b.ToString());
}
}

Output

int: 1.0
int: 4.0
int: 6.0
Summary. The StringBuilder AppendFormat method is useful for generating text based on a pattern. The method receives a variable number of arguments. We specified new lines in the AppendFormat method in both examples.
Note:For optimal code clarity, the AppendFormat method is ideal. It is not ideal for performance.

Answer 3

string name="热心网友";
string sex="男";
int age=19;
StringBuilder str=new StringBuilder();
str.AppendFormat("我的名字是:{0},性别:{1},年龄:{2}",name,sex,age);
类似与上面这种形式！

Answer 4

格式化构造字符串……这里应该是用于把向量组里的坐标连续输出
详情请查询MSDN