C#输入两个数，数字2必须大于数字1，计算从数字1到数字2的和

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using System;
using System.Collections.Generic;
using System.Text;
namespace KnowledgePoint
{
class _35_Ex_Function
{
/// <summary>
/// 方法练习
/// </summary>
/// <param name="args"></param>
static void Main(string[] args)
{
Console.Write("请输入第 1 个数字：");
string strNum01 = Console.ReadLine();
int intNum01 = DataTypeConversion(strNum01);
Console.Write("n请输入第 2 个数字：");
string strNum02 = Console.ReadLine();
int intNum02 = DataTypeConversion(strNum02);
TheSizeOfTheJudgment(ref intNum01, ref intNum02);
int sum = SumOfTwoNumbers(intNum01, intNum02);
Console.WriteLine("n计算结果：数字 1 和数字 2 的和为：" + sum);
Console.ReadKey();
}
/// <summary>
/// 返回两个数的累加和
/// </summary>
/// <param name="num1">数字1</param>
/// <param name="num2">数字2</param>
/// <returns>和</returns>
public static int SumOfTwoNumbers(int num1, int num2)
{
int sum = 0;
for (int i = num1; i <= num2; i++)
{
sum += i;
}
return sum;
}
/// <summary>
/// 判断两个数字的大小关系
/// </summary>
/// <param name="num1">数字1</param>
/// <param name="num2">数字2</param>
public static void TheSizeOfTheJudgment(ref int num1, ref int num2)
{
while (true)
{
if (num1 < num2)
{
return;
}
else
{
Console.WriteLine("n提示：数字 2 必须大于数字 1 ！");
Console.Write("n请重新输入第 1 个数字：");
string strNum1 = Console.ReadLine();
num1 = DataTypeConversion(strNum1);
Console.Write("n请重新输入第 2 个数字：");
string strNum2 = Console.ReadLine();
num2 = DataTypeConversion(strNum2);
}
}
}
/// <summary>
/// 数字类型转换
/// </summary>
/// <param name="target">目标数字</param>
/// <returns>转换结果</returns>
public static int DataTypeConversion(string target)
{
while (true)
{
try
{
int number = Convert.ToInt32(target);
return number;
}
catch
{
Console.WriteLine("n提示：数字格式异常！");
Console.Write("n请重新输入第 1 个数字：");
target = Console.ReadLine();
}
}
}
}
}