放大、缩小、平移、全图

int flag = 0;

private void btnZoomIn_Click(object sender, EventArgs e)
{
    axMapControl1.MousePointer = esriControlsMousePointer.esriPointerZoomIn;
    flag = 2;
}

private void brnZoomOut_Click(object sender, EventArgs e)
{
    axMapControl1.MousePointer = esriControlsMousePointer.esriPointerZoomOut;
    flag = 1;
}

private void btnPan_Click(object sender, EventArgs e)
{
    axMapControl1.MousePointer = esriControlsMousePointer.esriPointerPan;
    flag = 3;
}

private void btnFullExtent_Click(object sender, EventArgs e)
{
    axMapControl1.Extent = axMapControl1.FullExtent;
}

private void axMapControl1_OnMouseDown(object sender, IMapControlEvents2_OnMouseDownEvent e)
{
    IEnvelope ipEnv;
    if (flag == 2)
    {
        ipEnv = axMapControl1.TrackRectangle();
        ipEnv = axMapControl1.Extent;
        ipEnv.Expand(0.5, 0.5, true);
        axMapControl1.Extent = ipEnv;
    }
    else if (flag == 1)
    {
        ipEnv = axMapControl1.TrackRectangle();
        ipEnv = axMapControl1.Extent;
        ipEnv.Expand(2, 2, true);
        axMapControl1.Extent = ipEnv;
    }
    else if (flag == 3)
    {
        axMapControl1.Pan();
    }
}