c# AE pixelBlock3读写栅格数据

Question

C#+AE 使用pixelBlock3实现栅格数据逐项元操作：希望读取double类型的数据，并修改像元值，代码如下：

``` private void BuildRoute3(IRaster pRaster)
{
IRasterProps rasterProps = (IRasterProps)pRaster;
double[,] arrayvalue = new double[rasterProps.Height, rasterProps.Width];
IPnt pBlockSize = new PntClass();//栅格像素点
pBlockSize.SetCoords(1, 1);//设置像素块大小

        IPixelBlock pixelBlock = pRaster.CreatePixelBlock(pBlockSize);//按指定大小创建像素块
        IPnt topleft = new PntClass();
        for (int i = 0; i < rasterProps.Height; i++)
        {
            for (int j = 0; j < rasterProps.Width; j++)
            {
                topleft.SetCoords(i, j);
                pRaster.Read(topleft, pixelBlock);//读取指定位置像素块
                object obj = pixelBlock.GetVal(0, 0, 0);
                arrayvalue[i, j] = Convert.ToDouble(obj);
            }
        }

        double[,] arrayResultvalue = new double[rasterProps.Height, rasterProps.Width];

        //修改像元值，满足条件的赋为10
        int x = 250;
        int y = 277;
        int sum = 0;
        while (x > 0 && y > 0)
        {
            double value = arrayvalue[x, y];
            double value1 = arrayvalue[x - 1, y - 1];
            double value2 = arrayvalue[x, y - 1];
            double value3 = arrayvalue[x - 1, y];

            int no = 0;   //最大值下标
            if (value1 >= value2)
            {
                if (value1 >= value3)
                {
                    no = 1;
                }
                else
                {
                    no = 3;
                }
            }
            else
            {
                if (value3 >= value2)
                {
                    no = 3;
                }
                else
                {
                    no = 2;
                }
            }

            switch (no)
            {
                case 1:
                    arrayResultvalue[x - 1, y - 1] = 10;
                    x = x - 1;
                    y = y - 1;
                    break;
                case 2:
                    arrayResultvalue[x, y - 1] = 10;
                    y = y - 1;
                    break;
                case 3:
                    arrayResultvalue[x - 1, y] = 10;
                    x = x - 1;
                    break;
            }
            sum++;
        }
        if (y > 0)
        {
            while (y > 0)
            {
                arrayResultvalue[x , y] = 10;
                y--;
                sum++;
            }
        }
        else
        {
            while (x > 0)
            {
                arrayResultvalue[x, y] = 10;
                x--;
                sum++;
            }
        }

        //修改后的值转为byte重新写入栅格
        byte[,] transResult = new byte[rasterProps.Height, rasterProps.Width];
        for (int i = 0; i < rasterProps.Height; i++)
        {
            for (int j = 0; j < rasterProps.Width; j++)
            {
                if (arrayResultvalue[i, j] != 10)
                {
                    arrayResultvalue[i, j] = 0;
                }
                transResult[i, j] = (byte)arrayResultvalue[i, j]; 
            }
        }


        IPnt dealBlockSize = new PntClass();
        dealBlockSize.SetCoords(rasterProps.Height, rasterProps.Width);
        IPixelBlock3 pixelBlock3 = pRaster.CreatePixelBlock(dealBlockSize) as IPixelBlock3;
        IRasterEdit rasterEdit = pRaster as IRasterEdit;
        topleft.SetCoords(0, 0);//设置左上角点位置为写入起始定位
        pixelBlock3.set_PixelData(0, (System.Object)transResult);//将值设置到像素块中
        rasterEdit.Write(topleft, (IPixelBlock)pixelBlock3);//将像素块写入到栅格图像

    }

报错如下（复制链接在浏览器可以查看图片）：
![图片说明](https://img-ask.csdn.net/upload/201901/03/1546506224_922482.jpg)

Answer 1

你的报错图片说明看不了。。。；。