Unity 使用this关键字进行函数拓展 - LineRenderer

Example：

var lineRenderer = GetComponent<LineRenderer>();
lineRenderer
    .SetStartColor(Color.red)
    .SetEndColor(Color.red)
    .SetStartWidth(0.1f)
    .SetEndWidth(0.1f)
    .SetLinePosition(0, point1)
    .SetLinePosition(1, point2)
    .SetLoop(true)
    .SetCornerVertices(90)
    .SetEndCapVertices(90)
    .SetAlignment(LineAlignment.View)
    .SetTextureMode(LineTextureMode.Stretch);

Extension:

using UnityEngine;

namespace SK.Framework
{
    /// <summary>
    /// 光线渲染器相关拓展
    /// </summary>
    public static class LineRenderExtension
    {
        /// <summary>
        /// 设置起始宽度
        /// </summary>
        /// <param name="self">光线渲染器</param>
        /// <param name="width">起始宽度</param>
        /// <returns>光线渲染器</returns>
        public static LineRenderer SetStartWidth(this LineRenderer self, float width)
        {
            self.startWidth = width;
            return self;
        }
        /// <summary>
        /// 设置结束宽度
        /// </summary>
        /// <param name="self">光线渲染器</param>
        /// <param name="width">结束宽度</param>
        /// <returns>光线渲染器</returns>
        public static LineRenderer SetEndWidth(this LineRenderer self, float width)
        {
            self.endWidth = width;
            return self;
        }
        /// <summary>
        /// 设置起始颜色
        /// </summary>
        /// <param name="self">光线渲染器</param>
        /// <param name="color">起始颜色</param>
        /// <returns>光线渲染器</returns>
        public static LineRenderer SetStartColor(this LineRenderer self, Color color)
        {
            self.startColor = color;
            return self;
        }
        /// <summary>
        /// 设置结束颜色
        /// </summary>
        /// <param name="self">光线渲染器</param>
        /// <param name="color">结束颜色</param>
        /// <returns>光线渲染器</returns>
        public static LineRenderer SetEndColor(this LineRenderer self, Color color)
        {
            self.endColor = color;
            return self;
        }
        /// <summary>
        /// 设置点个数
        /// </summary>
        /// <param name="self">光线渲染器</param>
        /// <param name="count">点个数</param>
        /// <returns>光线渲染器</returns>
        public static LineRenderer SetPositionCount(this LineRenderer self, int count)
        {
            self.positionCount = count;
            return self;
        }
        /// <summary>
        /// 设置点位置
        /// </summary>
        /// <param name="self">光线渲染器</param>
        /// <param name="index">索引</param>
        /// <param name="position">位置</param>
        /// <returns>光线渲染器</returns>
        public static LineRenderer SetLinePosition(this LineRenderer self, int index, Vector3 position)
        {
            self.SetPosition(index, position);
            return self;
        }
        /// <summary>
        /// 设置是否循环（终点是否连接起点）
        /// </summary>
        /// <param name="self">光线渲染器</param>
        /// <param name="loop">是否循环</param>
        /// <returns>光线渲染器</returns>
        public static LineRenderer SetLoop(this LineRenderer self, bool loop)
        {
            self.loop = loop;
            return self;
        }
        /// <summary>
        /// 设置CornerVertices属性
        /// </summary>
        /// <param name="self">光线渲染器</param>
        /// <param name="cornerVertices">conner vertices</param>
        /// <returns>光线渲染器</returns>
        public static LineRenderer SetCornerVertices(this LineRenderer self, int cornerVertices)
        {
            self.numCornerVertices = cornerVertices;
            return self;
        }
        /// <summary>
        /// 设置EndCapVertices属性
        /// </summary>
        /// <param name="self">光线渲染器</param>
        /// <param name="endCapVertices">end cap vertices</param>
        /// <returns>光线渲染器</returns>
        public static LineRenderer SetEndCapVertices(this LineRenderer self, int endCapVertices)
        {
            self.numCapVertices = endCapVertices;
            return self;
        }
        /// <summary>
        /// 设置Alignment属性
        /// </summary>
        /// <param name="self">光线渲染器</param>
        /// <param name="alignment">alignment</param>
        /// <returns>光线渲染器</returns>
        public static LineRenderer SetAlignment(this LineRenderer self, LineAlignment alignment)
        {
            self.alignment = alignment;
            return self;
        }
        /// <summary>
        /// 设置TextureMode
        /// </summary>
        /// <param name="self">光线渲染器</param>
        /// <param name="textureMode">texture mode</param>
        /// <returns>光线渲染器</returns>
        public static LineRenderer SetTextureMode(this LineRenderer self, LineTextureMode textureMode)
        {
            self.textureMode = textureMode;
            return self;
        }
        /// <summary>
        /// 设置材质球
        /// </summary>
        /// <param name="self">光线渲染器</param>
        /// <param name="material">材质球</param>
        /// <returns>光线渲染器</returns>
        public static LineRenderer SetMaterial(this LineRenderer self, Material material)
        {
            self.material = material;
            return self;
        }
    }
}