可以是菱形了

for (int h = 1; h <= 10; h++)
{

 

for (int kg = 10; kg >= h; kg--)
{
Console.Write("  ");
}

for (double xx=1;xx<=h ;xx=xx+0.5)
{
Console.Write("66");

}
Console.Write("\n");

}

for (int h2=1; h2<=10;h2++ )
{
for (int kg2=1; kg2<=h2;kg2++ )
{
Console.Write("  ");

}

for (double xx2=10;xx2>=h2 ;xx2=xx2-0.5 )
{
Console.Write("55");
}

Console.Write("\n");

}