C#：将具有超过10k行的xml加载到XmlDocument变量时删除特殊字符

下面的代码在xml具有“&”和“”时不起作用

事情已经尝试过了：

HugeXmlVariable = System.Security.SecurityElement.Escape(HugeXmlVariable);

HugeXmlVariable = HugeXmlVariable.ToSTrein().Replace("&", string.Empty).Replace(">", "&gt;").Replace("<", "&lt;").Replace("'", "&apos;").Replace("\"", "&quot;").ToString();

HugeXmlVariable = XmlConvert.DecodeName(HugeXmlVariable);

HugeXmlVariable=System.Security.SecurityElement.Escape（HugeXmlVariable）；
HugeXmlVariable=HugeXmlVariable.ToSTrein（）.Replace（&），string.Empty.Replace（“>”，”）.Replace（你能试试下面的方法吗

    public static string RemoveSpecialCharacters(string str)
    {
        StringBuilder sb = new StringBuilder();
        foreach (char c in str)
        {
            if ((c >= '0' && c <= '9') || (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || c == '.' || c == '_')
            {
                sb.Append(c);
            }
        }
        return sb.ToString();
    }

公共静态字符串删除特殊字符（字符串str）
{
StringBuilder sb=新的StringBuilder（）；
foreach（str中的字符c）
{
如果（（c>='0'&&c='A'&&c='A'&&c如果XML无效，我们可以将其作为文本读取，然后将替换的文本解析到流中。然后从流中加载有效的XML字符串。

string filepaht="your xml path";
string data=File.ReadAllText(filepath);
Stream newdata=null;

 StreamReader strReader = null;
            try
            {
                //Lookup the encoding. If we not find the specified encoding, we use UTF-8.

               Encoding  messageEncoding = Encoding.UTF8;

                strReader = new StreamReader(data, messageEncoding);

                // Read the entire message into a string. Not a good idea if you receive largeish messages. Then you ned a bufferen approach
                string msgBodyContentString = strReader.ReadToEnd();

                string[] searchStrings = SearchString.Split(STRING_SEPARATOR.ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
                string[] replaceStrings = ReplaceString.Split(STRING_SEPARATOR.ToCharArray(), StringSplitOptions.RemoveEmptyEntries);

                for (int index = 0; index <= (searchStrings.Length -1); index++)
                {
                    string oldValue = searchStrings[index];
                    if (!string.IsNullOrEmpty(oldValue))
                    {
                        //default to string empty if we do not have a replace value
                        string newValue = string.Empty;
                        if (index <= replaceStrings.Length - 1)
                            newValue = replaceStrings[index];

                        msgBodyContentString = msgBodyContentString.Replace(Regex.Unescape(oldValue), Regex.Unescape(newValue));
                    }
                }

                // Convert to bytes
                byte[] msgBodyContentBytes = Encoding.Unicode.GetBytes(msgBodyContentString);

                // Convert the encoding
                byte[] msgBodyContentBytesConverted = Encoding.Convert(Encoding.Unicode, messageEncoding, msgBodyContentBytes);

                // Write new stream back
                newdata = new MemoryStream(msgBodyContentBytesConverted);                                        
            }


var inputXml = XDocument.ReadFrom(newdata);

string filepaht=“您的xml路径”；
字符串数据=File.ReadAllText（文件路径）；
流newdata=null；
StreamReader strReader=null；
尝试
{
//查找编码。如果找不到指定的编码，则使用UTF-8。
Encoding messageEncoding=Encoding.UTF8；
strReader=新的StreamReader（数据、消息编码）；
//将整个消息读入一个字符串。如果您收到大量消息，这不是一个好主意。然后您使用了bufferen方法
字符串msgBodyContentString=strReader.ReadToEnd（）；
string[]searchStrings=SearchString.Split（string_SEPARATOR.ToCharArray（），StringSplitOptions.removeMptyEntries）；
string[]replaceStrings=ReplaceString.Split（string_SEPARATOR.tocharray（），StringSplitOptions.removeMptyEntries）；
对于（int index=0；index请提供相关XML的一个小样本。如果XML无效，则除了修复它之外，没有其他解决方案。XML是如何生成的？如果您有任何未替换的字符，则首先将XML解析为非XML时会遇到重大问题。@DanWilson-pos中更新的XMLt XML无效，因为元素值中的
&
应该是
&；
和
@DanWilson我无法更正输入的XML，我已经修复了它，并且我尝试用它替换检查每个字符它将花费大量时间。
    public static string RemoveSpecialCharacters(string str)
    {
        StringBuilder sb = new StringBuilder();
        foreach (char c in str)
        {
            if ((c >= '0' && c <= '9') || (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || c == '.' || c == '_')
            {
                sb.Append(c);
            }
        }
        return sb.ToString();
    }

string filepaht="your xml path";
string data=File.ReadAllText(filepath);
Stream newdata=null;

 StreamReader strReader = null;
            try
            {
                //Lookup the encoding. If we not find the specified encoding, we use UTF-8.

               Encoding  messageEncoding = Encoding.UTF8;

                strReader = new StreamReader(data, messageEncoding);

                // Read the entire message into a string. Not a good idea if you receive largeish messages. Then you ned a bufferen approach
                string msgBodyContentString = strReader.ReadToEnd();

                string[] searchStrings = SearchString.Split(STRING_SEPARATOR.ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
                string[] replaceStrings = ReplaceString.Split(STRING_SEPARATOR.ToCharArray(), StringSplitOptions.RemoveEmptyEntries);

                for (int index = 0; index <= (searchStrings.Length -1); index++)
                {
                    string oldValue = searchStrings[index];
                    if (!string.IsNullOrEmpty(oldValue))
                    {
                        //default to string empty if we do not have a replace value
                        string newValue = string.Empty;
                        if (index <= replaceStrings.Length - 1)
                            newValue = replaceStrings[index];

                        msgBodyContentString = msgBodyContentString.Replace(Regex.Unescape(oldValue), Regex.Unescape(newValue));
                    }
                }

                // Convert to bytes
                byte[] msgBodyContentBytes = Encoding.Unicode.GetBytes(msgBodyContentString);

                // Convert the encoding
                byte[] msgBodyContentBytesConverted = Encoding.Convert(Encoding.Unicode, messageEncoding, msgBodyContentBytes);

                // Write new stream back
                newdata = new MemoryStream(msgBodyContentBytesConverted);                                        
            }


var inputXml = XDocument.ReadFrom(newdata);