c# - Counting an Array XNA HLSL -

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wondering how count array in hsls? say, have array declared in our effect file:

float2 position[1];

and inside our source set parameter else instance:

effect.parameter["position"].setvalue(myvector2array);

under shadering function how count array? similar to: 

float4 ps_function(float2 tex : texcoord0) : color0 { int size = position.count(); }

thanks in advance :]

the simple way declare constant define array size:

const static int max_positions = 1 float2 position[max_positions];

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