字符数字随机生成源码

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//随机字符串类型
    public enum stringtype
    ...{
        allstring = 1,//大小写字母
        allnumic = 2,//数字
        str_num = 3,//大小写字母+数字
        str_upper = 4,//大写字母
        str_lower = 5 //大写字母
    }

    //生成随机字符串
    public static string GenerateRandom(int Length,stringtype s)
    ...{
        string strtemp="";
        string[] constant=null;
        switch (s)
        ...{
            case stringtype.allnumic :
                strtemp="0,1,2,3,4,5,6,7,8,9";
                constant = strtemp.Split(',');
                break;
            case stringtype.allstring :
                strtemp ="a,b,c,d,e,f,g,h,i,j,k,m,n,o,p,q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,D,G,H,I,J,K,L,M,N,P,Q,R,S,T,U,V,W,X,X,Y,Z";
                constant = strtemp.Split(',');
                break;
            case stringtype.str_lower :
                strtemp = "a,b,c,d,e,f,g,h,i,j,k,m,n,o,p,q,r,s,t,u,v,w,x,y,z";
                constant = strtemp.Split(',');
                break;
            case stringtype.str_num :
                strtemp = "a,b,c,d,e,f,g,h,i,j,k,m,n,o,p,q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,D,G,H,I,J,K,L,M,N,P,Q,R,S,T,U,V,W,X,X,Y,Z,0,1,2,3,4,5,6,7,8,9";
                constant = strtemp.Split(',');
                break;
            case stringtype.str_upper :
                strtemp = "A,B,C,E,F,D,G,H,I,J,K,L,M,N,P,Q,R,S,T,U,V,W,X,Y,Z";
                constant = strtemp.Split(',');
                break;
        }

        System.Text.StringBuilder newRandom = new System.Text.StringBuilder(Length);
        Random rd = new Random();
        for (int i = 0; i < Length; i++)
        ...{
            newRandom.Append(constant[rd.Next(constant.Length-1)]);
        }
        return newRandom.ToString();
    }