C# 流程控制语句

1. if 语句

for (int i = 0; i < 10; i++)

{

if (i == 5)

{

continue;

}

else if (i == 8)

{

MessageBox.Show("今天是晴天");

break;

}

MessageBox.Show("i=:" + i.ToString());

}

2. switch 多分支语句

for (int i = 0; i < 3; i++)

{

switch (i)

{

case 1:

MessageBox.Show("今天是阴天");

break;

case 2:

MessageBox.Show("今天下大雨");

break;

case 0:

MessageBox.Show("今天是晴天");

break;

default:

break;

}

}

5.2 循环语句

1. while 语句、

int i1 = 0;

while (i1 < 20)

{

i1++;

if (i1 == 10)

{

break;

}

MessageBox.Show("i=:" + i1);

}

2. do...while 语句

do

{

i1++;

if (i1 == 10)

{

MessageBox.Show("循环结束");

return;

}

MessageBox.Show("i=:" + i1);

} while (i1 < 20);

3. for 语句

for (int i = 0; i < 3; i++)

{

switch (i)

{

case 1:

MessageBox.Show("今天是阴天");

break;

case 2:

MessageBox.Show("今天下大雨");

break;

case 0:

MessageBox.Show("今天是晴天");

break;

default:

break;

}

}

4. foreach 语句

ArrayList a = new ArrayList();

StringBuilder s1 = new StringBuilder();

StringBuilder s2 = new StringBuilder();

StringBuilder s3 = new StringBuilder();

StringBuilder s4 = new StringBuilder();

a.Add(s1.Append("扩视"));

a.Add(s2.Append("机器"));

a.Add(s3.Append("视觉"));

a.Add(s4.Append("实训基地"));

foreach (var item in a)

{

MessageBox.Show(item.ToString());

}

5.3 跳转语句

1. break 语句

2. continue 语句

3. return 语句