A discretization method is presented in order to describe structural properties of Yukawa-type fluids consisting of particles with a continuous size and charge distribution. The accuracy of the method is tested by comparing the results from the Rogers-Young closure scheme of the Ornstein-Zernike equation for the correlation functions with the corresponding Monte Carlo data. The relevance of this method for the interpretation of light- and neutron-scattering data of colloidal dispersions is also briefly discussed. © 1992 The American Physical Society.