VB.NET生成随机串或随机数字的方法总结
本文一共介绍了5种生成随机数方式,具体如下:
第一种:转载的方法
PublicEnumstringtype 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 EndEnum FunctionGenerateRandom(ByValLengthAsInteger,ByValsAsstringtype)AsString DimstrtempAsString="" Dimconstant()AsString=Nothing SelectCases Casestringtype.allnumic strtemp="0,1,2,3,4,5,6,7,8,9" constant=strtemp.Split(",") Casestringtype.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(",") Casestringtype.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(",") Casestringtype.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(",") Casestringtype.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(",") EndSelect DimNewRandomAsSystem.Text.StringBuilder=NewSystem.Text.StringBuilder(Length) DimrdAsRandom=NewRandom() DimiAsInteger Fori=0ToLength-1Stepi+1 NewRandom.Append(constant(rd.Next(constant.Length-1))) Next ReturnNewRandom.ToString() EndFunction
第二种:网上查找
PublicFunctionGetOAuthNonce()AsString'得到随机值 DimresultAsString=System.Guid.NewGuid().ToString() result=result.Replace("-","") Returnresult.Substring(0,10) EndFunction
PublicFunctionRandCode(ByValnAsInteger)AsString DimarrCharAsChar()=NewChar(){"a"c,"b"c,"d"c,"c"c,"e"c,"f"c,_ "g"c,"h"c,"i"c,"j"c,"k"c,"l"c,_ "m"c,"n"c,"p"c,"r"c,"q"c,"s"c,_ "t"c,"u"c,"v"c,"w"c,"z"c,"y"c,_ "x"c,"0"c,"1"c,"2"c,"3"c,"4"c,_ "5"c,"6"c,"7"c,"8"c,"9"c,"A"c,_ "B"c,"C"c,"D"c,"E"c,"F"c,"G"c,_ "H"c,"I"c,"J"c,"K"c,"L"c,"M"c,_ "N"c,"Q"c,"P"c,"R"c,"T"c,"S"c,_ "V"c,"U"c,"W"c,"X"c,"Y"c,"Z"c} DimnumAsNewStringBuilder() DimrndAsNewRandom(DateTime.Now.Millisecond) ForiAsInteger=0Ton-1 num.Append(arrChar(rnd.[Next](0,arrChar.Length)).ToString()) Next Returnnum.ToString() EndFunction
第三种:原来是C#转换
PublicFunctionRandCode(ByValnAsInteger)AsString DimarrCharAsChar()=NewChar(){"a"c,"b"c,"d"c,"c"c,"e"c,"f"c,_ "g"c,"h"c,"i"c,"j"c,"k"c,"l"c,_ "m"c,"n"c,"p"c,"r"c,"q"c,"s"c,_ "t"c,"u"c,"v"c,"w"c,"z"c,"y"c,_ "x"c,"0"c,"1"c,"2"c,"3"c,"4"c,_ "5"c,"6"c,"7"c,"8"c,"9"c,"A"c,_ "B"c,"C"c,"D"c,"E"c,"F"c,"G"c,_ "H"c,"I"c,"J"c,"K"c,"L"c,"M"c,_ "N"c,"Q"c,"P"c,"R"c,"T"c,"S"c,_ "V"c,"U"c,"W"c,"X"c,"Y"c,"Z"c} DimnumAsNewStringBuilder() DimrndAsNewRandom(DateTime.Now.Millisecond) ForiAsInteger=0Ton-1 num.Append(arrChar(rnd.[Next](0,arrChar.Length)).ToString()) Next Returnnum.ToString() EndFunction
第四种:利用VB6转换
FunctionmakeRand(ByValmaxLenAsInteger)AsString'生成签名时用随机串 DimstrNewPassAsString=vbNullString DimlowerAsLong DimwhatsNextAsLong DimupperAsLong DimintCounterAsLong Randomize() ForintCounter=1TomaxLen whatsNext=Int((1-0+1)*Rnd()+0) IfwhatsNext=0Then upper=122 lower=100 Else upper=57 lower=48 EndIf strNewPass=strNewPass&Chr(Int((upper-lower+1)*Rnd()+lower)) Next makeRand=strNewPass EndFunction
第五种:直接用VB.NET函数
DimrandAsRandom=NewSystem.Random(10)‘这里10就代表是10为 Debug.Print(rand.Next().ToString)
原文链接:http://blog.csdn.net/lcp58006478/article/details/8958460
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