方法一
public string GetRandomColor()
{
Random RandomNum_First = new Random((int)DateTime.Now.Ticks);
// 对于C#的随机数，没什么好说的
System.Threading.Thread.Sleep(RandomNum_First.Next(50));
Random RandomNum_Sencond = new Random((int)DateTime.Now.Ticks);
// 为了在白色背景上显示，尽量生成深色
int int_Red = RandomNum_First.Next(256);
int int_Green = RandomNum_Sencond.Next(256);
int int_Blue = (int_Red + int_Green > 400) ? 0 : 400 - int_Red - int_Green;
int_Blue = (int_Blue > 255) ? 255 : int_Blue;
return Color.FromArgb(int_Red, int_Green, int_Blue).Name;
}
方法二
/// <summary>
/// RandomColor 的摘要说明。
/// </summary>
public class RandomColor
{
//字段
private Random random; //随机数生成器对象
private int seed; //生成随机数的种子
private int minAlpha; //最小alpha分量
private int maxAlpha; //最大alpha分量
private int minRed; //最小红色分量
private int maxRed; //最大红色分量
private int minGreen; //最小绿色分量
private int maxGreen; //最大绿色分量
private int minBlue; //最小蓝色分量
private int maxBlue; //最大蓝色分量
/// <summary>
/// 构造函数
/// </summary>
public RandomColor()
: this((int)DateTime.Now.Ticks, 0, 256, 0, 256, 0, 256, 0, 256)
{
}
public RandomColor(int seed)
: this(seed, 0, 256, 0, 256, 0, 256, 0, 256)
{
}
public RandomColor(int seed, int minAlpha, int maxAlpha, int minRed, int maxRed, int minGreen, int maxGreen, int minBlue, int maxBlue)
{
//请在这里加入校验颜色分量大小的判断，如果小于0，大于256，则抛出异常。
//因为颜色分量的范围大于等于0，小于等于255。
this.seed = seed;
random = new Random(seed);
this.minAlpha = minAlpha;
this.maxAlpha = maxAlpha;
this.minRed = minRed;
this.maxRed = maxRed;
this.minGreen = minGreen;
this.maxGreen = maxGreen;
this.minBlue = minBlue;
this.maxBlue = maxBlue;
}
/// <summary>
/// 得到随机颜色
/// </summary>
/// <returns>返回生成的随机颜色</returns>
public Color GetRandomColor()
{
int a, r, g, b;
a = random.Next(minAlpha, maxAlpha);
r = random.Next(minRed, maxRed);
g = random.Next(minGreen, maxGreen);
b = random.Next(minBlue, maxBlue);
return Color.FromArgb(a, r, g, b);
}
/// <summary>
/// 得到随机颜色数组
/// </summary>
/// <param name="count">数组的元素个数</param>
/// <returns>返回生成的颜色数组</returns>
public Color[] GetRandomColorArray(int count)
{
Color[] colors = new Color[count];
for (int i = 0; i < count; i++)
colors[i] = GetRandomColor();
return colors;
}
}
- 本文标题： ASP.NET 随机获取颜色值
- 文章分类：【.NET/Web】
- 非特殊说明，本文版权归【胡同里的砖头】个人博客 所有，转载请注明出处.